sit
Latinsit, settle, be placed
About This Root
The root sit comes from Latin sedēre, 'to sit' — one of the oldest and most physical verbs in the language. To a Roman, sedēre meant lowering your body onto a bench and staying put. That single image of resting in one place fans out into an entire family of English words, and the trick to reading them is to keep asking: who is sitting, and where?
The present stem stays as -sid- inside compounds, where a prefix tells you the position of the sitting:
- re- (back) + sidēre → reside: to sit back down in a place and stay — to live there. Hence resident and residence.
- prae- (before, in front) + sidēre → preside: to sit in front of an assembly, in the chairman's seat — to be in charge. The one who sits in front is the president, and the office is the presidency.
- sub- (down, under) + sidēre → subside: to sit down, to sink — a flood subsides, pain subsides, land subsides. The government grant that 'sits underneath' a struggling industry to prop it up is a subsidy (to subsidize).
- dis- (apart) + sidēre → dissident: one who 'sits apart' from the official line — a person who disagrees, an opponent of the regime.
- in- (in, on) + sidēre → insidious: 'sitting in wait,' like an ambush. What is insidious harms you slowly and stealthily, because it was lying in wait the whole time.
- super- (above) + sēdēre → supersede: to sit above and so take the place of something older. (Note the rare spelling -sede, not -cede.)
The past-participle stem sess- (sessus) gives a second wave, often with the prefix assimilated:
- A period of sitting together is a session — a court that 'sits,' a meeting in session, even a login session that stays open.
- ad- (to) + sess- → assess: originally a judge's assistant who 'sat beside' the magistrate to set the amount of a tax. From that came assessment, assessor, reassess.
- ob- (on, against) + sess- → obsess: a thought that 'sits on' you and won't get up; you are obsessed, gripped by an obsession.
- pot- (able, having power) + sess- → possess: to be able to sit on something, to occupy and own it. Hence possession, possessive, repossess, dispossessed.
A few quieter members come straight from sed-: sediment is what 'sits down' to the bottom of a liquid; something sedentary keeps you sitting; sedate and a sedative make you calm and still, as if seated. And the everyday Latin sit- words — site, situation, situational — describe where a thing is placed, where it 'sits' in the world.
The rule for the whole family: find the sit (sid / sed / sess), then let the prefix tell you the position. Sit in front → preside. Sit apart → dissident. Sit on top → obsess or possess. Sit back down → reside. Once you see the seat, every word in the family has a place to sit.
Every sit / sid / sed / sess word is about someone or something taking a seat. The president sits before the room; a resident sits back down to stay; sediment sits at the bottom; an obsession sits on your mind and won't move. Spot the seat, then let the prefix tell you where it sits.
Core Words Deep Dive
The few words from this family worth telling in full — one by one.
The most familiar member, hiding the clearest image. Latin prae- (before) + sidēre (sit) = 'one who sits in front.' Before it meant a head of state, it simply named whoever sat in the front chair of an assembly and ran the meeting — the chairperson. That is why you can still preside over a dinner or a committee: you are taking the front seat.
A word whose menace lives in its etymology. in- (in) + sidēre (sit) = 'sitting in wait,' the posture of an ambush — the Latin insidiae meant 'an ambush.' That is why insidious does not describe loud, obvious harm; it describes harm that was crouching quietly the whole time and only shows itself once it's too late: an insidious disease, an insidious lie.
Not obviously a 'sit' word at all. Latin potis (able, having power) + sedēre (sit) = 'to be able to sit upon' — to occupy a seat and so own it. To possess land was literally to plant yourself on it. The same root explains the eerie sense 'a spirit possesses someone': it sits inside them and takes the seat of control. What possessed you? = what sat down in your mind and took over?
sub- (under) + sidēre (sit) → subsidium in Latin meant the reserve troops who 'sat behind' the front line, ready to support it. The military backup became any financial backup that sits underneath a person or industry to keep it from collapsing: a government subsidy props up farmers, housing, fuel. Sister word subside (sit down → sink) shows the same root pulling the other direction.
ob- (on, against) + sess- (sat) = 'to sit on / besiege.' The Romans used it for an enemy army sitting down around a city to lay siege. That siege image is exactly right: an obsession is a thought that has camped around your mind and won't lift. You don't choose it — it sits on you, which is why we say obsessed with, not obsessed about something you control.
Related Roots
sit (sedēre) is about resting in place; sta (stāre) is about standing firm. Both describe staying put, but the posture is opposite — sitting vs standing. residence (a place you sit down in) vs constant/stable (things that stand). When the image is lowering down and settling → sit; when it is holding upright → sta.
Both can mean 'stay / remain in a place.' reside (sit back down) and remain (manēre, stay) overlap, but reside is about having one's home or being located somewhere, while remain is about continuing to be left after others go. He resides in Paris (lives there) vs only three remained (were left).
Associated Words · 98
assess
To evaluate the value or quality of something; to impose a tax or charge
assessable
Able to be evaluated or taxed
assessment
The process of evaluating something; an official judgment of value
assessor
An official who evaluates property for tax; an expert adviser to a court
assiduous
Hardworking, diligent, and persistent
assiduously
In a diligent and persistent manner
baby-sit
To look after a child temporarily while parents are away
baby-sitting
The work of caring for a child while parents are away
bedsit
A single rented room serving as both bedroom and living room
besiege
To surround with armed forces; to overwhelm with demands
consider
To think about seriously
considerately
In a thoughtful, caring manner
dispossess
To deprive someone of their property or land
dispossessed
Deprived of property or home; homeless
dispossession
The act of depriving someone of property or land
dissidence
Open disagreement with authority or official policy
dissident
A person who opposes the government or authority; disagreeing with official policy
ex-president
A former president
government-subsidized
Supported through government subsidies
homesite
A plot of land for building a house on
ill-considered
Done without sufficient thought or care
inconsiderable
Too small or unimportant to deserve attention
insidious
Causing harm gradually and stealthily; treacherously deceptive
non-resident
A person not permanently residing in a place; not permanently based somewhere
nonresidential
Not used as a residence; relating to commercial or non-living spaces
obsess
To preoccupy the mind completely; to think about constantly
obsessed
Intensely and excessively preoccupied with something
obsession
A compulsive, unhealthy preoccupation with something or someone
obsessive
Thinking about something excessively; a person with an obsession
obsessively
In an obsessive, compulsive manner
possess
To own or have something; to control someone's mind; 拥有；控制
possession
The state of owning something; an item owned; 拥有；财产
possessive
Unwilling to share; relating to ownership; the grammatical possessive case
possessively
In a possessive manner; with desire to own or control
possessiveness
Excessive desire to own or control people or things
possessor
A person who owns or holds something
possessory
Relating to legal possession or ownership rights
post-presidential
Relating to the period after a presidential term
preassessment
An evaluation carried out before a main assessment
preside
To lead or be in charge of a meeting or organization
presidency
The office or term of a president
president
the head of state of a republic; the leader of an organization
presidential
Relating to a president or presidency; having a dignified, presidential manner
presidentially
In a manner befitting a president
reassess
To consider or evaluate something again in light of new information
reassessment
A new or revised evaluation of something
repossess
To reclaim property due to unpaid debt; to regain possession
repossession
The act of reclaiming property after default on payments
reside
To live in a place permanently or for a long time
residence
The place where someone lives; one's home
residency
The state of living in a place; a period of hospital medical training
resident
A person who lives in a particular place; living or based in a place long-term
residential
Relating to or consisting of homes or housing areas
residentially
In a residential manner
residents
People who live in a particular place
residual
Remaining after the main part is removed; a leftover amount
risk-assessment
The process of identifying and evaluating potential risks
sedate
To calm with a sedative drug; calm and dignified in manner
sedately
In a calm and composed manner
sedation
A calm state induced by sedative drugs
sedative
A drug that calms or induces sleep; having a calming effect
sedentary
Involving little physical activity; staying in one place
sediment
Particles that settle at the bottom of a liquid; to deposit as sediment
sedimentary
Formed by accumulation of small particles
sedimentation
The settling of solid particles in a liquid; sedimentation
self-assessed
Evaluated by oneself
self-assessment
An evaluation of oneself or one's own performance
self-obsessed
Excessively focused on oneself; narcissistic and egotistical
self-possessed
Calm and in full control of one's emotions
self-possession
Calmness and composure, especially under stress
session
A period devoted to an activity; an official meeting or term; a user login period
settlement
A resolution of a dispute; a newly established colony or community
settler
A person who moves to and establishes a home in a new region
sit
to rest with the weight on the buttocks
sitcom
A comedy series based on humorous everyday situations
site
the location of something; a website
sitting-room
A room for relaxing or receiving guests; a living room
situate
To place in a particular location or position
situated
Located in a particular place
situation
the conditions or circumstances at a given time
situational
Relating to or depending on a particular situation
size
the magnitude or dimensions of something
state-subsidized
Receiving financial support from the government
subside
To become less intense or active; to sink or settle down
subsidence
A gradual sinking of ground; a reduction in intensity
subsiding
The process of sinking or becoming less intense
subsidize
To financially support with a subsidy
subsidized
Receiving financial support to reduce costs
subsidy
Financial assistance or grant, especially from a government
supersede
To replace something older or less effective
supersession
The act of replacing or setting aside something
unconsidered
Not carefully thought about; done without proper reflection
unpresidential
Not appropriate or fitting for a president
unsubsidized
Not receiving financial subsidies
vice-presidency
The office or term of a vice president
vice-president
A deputy to a president in government or an organization
vice-presidential
Relating to a vice president or vice presidency
worksite
A location where work takes place