val
Latinstrong, worth, value
About This Root
The root val comes from Latin valēre, a verb with a wonderfully wide reach. At its core it meant "to be strong, to be well, to be worth." A healthy Roman soldier valēbat — he was fit and powerful. A coin valēbat — it was worth a certain amount. The same word covered physical strength, good health, and monetary worth, because to a Roman these were all forms of the same thing: having power, holding up, counting for something.
From the "worth" side of valēre English built its biggest val family — the value cluster:
- value = the worth of something
- valuable = having a lot of worth
- invaluable = so valuable its worth can't even be measured (the in- here means "not [measurable]," not "worthless")
- evaluate = e- (out) + value → to draw the worth out, to judge how much something is worth
- devalue / undervalue / overvalue = to push worth down, set it too low, or set it too high
From the "be strong enough to stand" side comes the valid cluster: something valid is strong enough to hold up under scrutiny — a valid argument stands, a valid ticket is legally sound. invalid won't stand; validate makes it stand; validity is the quality of standing.
Add a prefix and the "being stronger" sense produces a third group:
- pre- (before, ahead) + valēre → prevail: to be stronger than the others, to come out ahead. From it, prevalent / prevailing / prevalence describe whatever is currently "winning" — the dominant, widespread thing.
- equ- (equal) + val → equivalent: of equal worth or strength.
- ambi- (both) + val → ambivalent: pulled with equal force in both directions, hence torn, of two minds.
- avail (via Old French, ad- "to" + valēre) → to be of worth to someone, to be useful; available = able to be used.
The "strength" sense also gave us courage words borrowed through French: valiant and valor — strength of heart on the battlefield. And medicine kept the "health" sense in convalesce (con- + valēscere "to grow strong") = to gradually grow strong again after illness.
Finally, one surprising member. Romans said goodbye with "Valē!" — literally the command "Be strong! / Be well!", our equivalent of "take care." That little farewell survives in valediction (vale + dicere "to say" = the saying of goodbye) and the American valedictorian, the graduate who gives the farewell speech. So the same root that prices a diamond and validates a contract also whispers the last goodbye.
Think of the word value sitting at the center. Everything val is about "how much something is worth or how strong it stands": a valuable gem (high worth), a valid ticket (stands up), prevail (comes out strongest). Even the Roman goodbye "Valē!" meant "stay strong" — be well.
Core Words Deep Dive
The few words from this family worth telling in full — one by one.
The anchor of the whole family. Latin valēre meant 'to be worth,' so value is literally 'worth-ness.' Notice it splits two ways in English: as a noun it's how much something is worth (the value of a house), and as a verb it's the act of treating something as worthwhile (I value your honesty). Plural values shifts to morals — the things a person treats as worth holding onto.
From valēre 'to be strong' — a valid argument is one strong enough to stand up under challenge. The image is structural: weak claims collapse, valid ones hold. This is why valid spans logic (a valid deduction), law (a valid contract), and everyday life (a valid point) — in every case, it 'holds up.'
pre- (ahead, before) + valēre (be strong) = to be the strongest, to come out ahead. Two senses grow from this: 'to win' (justice will prevail — strength wins out) and 'to be widespread' (the prevailing wind, the prevailing opinion — the dominant one that has 'won' the room). Note prevail upon someone is a third, older sense: to use one's strength of persuasion to get someone to do something.
ambi- (both) + val (strength) = having strong feelings pulling in both directions at once. Coined by a psychiatrist around 1910, it's not mild indifference — it's the tension of genuinely wanting and not wanting the same thing. You're ambivalent about a job offer when both yes and no feel powerful.
con- (intensifier) + valēscere (to grow strong) = to gradually grow strong again. This keeps valēre's oldest sense — physical health and strength — alive. You convalesce after surgery: not instant recovery, but the slow process of strength returning. The convalescent home is where that slow strengthening happens.
Related Roots
Both touch on strength, but val (valēre) is about being strong, well, or worth something — an inner capacity (valid, value, prevail). firm (firmus) is about being steady and unshaken — physical or structural solidity (confirm, affirm). Quick test: worth or power → val; steadiness → firm.
Not the same root, but they fuse in one family: valediction / valedictorian = vale (val, 'be well/farewell') + dic (say). The val part carries the 'be well' farewell; the dic part carries the 'saying.'
Associated Words · 48
ambivalence
Mixed or conflicting feelings about someone or something
ambivalent
Having mixed or contradictory feelings about something
ambivalently
In a way that shows mixed or contradictory feelings
avail
To be of use or benefit; practical effect or use
available
Such as one may avail oneself of; capable of being used for the accomplishment of a purpose
convalesce
To gradually recover health after illness
convalescent
Recovering from illness; a person doing so
devaluation
An official reduction in currency value; a lowering of worth
devalue
To reduce the value of a currency or something
equivalent
Equal in value or effect; something equal to another
evaluable
Capable of being assessed or evaluated
evaluate
To assess or judge the quality or value of something
evaluation
A formal assessment of quality or performance
family-values
Traditional moral values associated with family life
invalid
Not legally or logically acceptable; a person disabled by illness or injury
invalidate
To make something void or prove it wrong
invalidation
The act of making something void or nullifying it
invalidity
The state of being invalid or without legal force
invaluable
Extremely useful or precious; of immeasurable value
overvaluation
Assigning too high a value to something
overvalue
To assign too high a value to something
overvalued
Assigned too high a value
prevail
To win or gain the upper hand; to be widespread
prevailing
Most common or dominant at a particular time
prevalence
The state of being widespread or common
prevalent
Widespread or commonly occurring
re-evaluate
To assess or reconsider again; 重新评估，重新审视
re-evaluation
A fresh assessment or reconsideration; 重新评估，再评价
self-evaluation
An assessment of one's own abilities or performance
truth-value
The logical status of a statement as true or false
undervaluation
Assigning too low a value to something
undervalue
To assign too low a value to; to underestimate
undervalued
Assigned a value that is too low
valediction
A farewell speech or statement
valedictorian
The top-ranked student who delivers the farewell speech at graduation
valedictory
A farewell speech at graduation; relating to a farewell
valiant
Showing great courage and bravery
valiantly
In a brave and determined manner
valid
Logically sound; legally acceptable; well-founded
validate
To confirm the truth or legality of something; to verify
validity
The quality of being logically sound or legally acceptable
validly
In a valid or legitimate manner
valor
Great courage and bravery, especially in battle
valorous
Showing great courage and bravery; heroic
valuable
Worth a lot of money or highly useful; a precious personal possession
valuation
An estimation of the monetary worth or importance of something
value
the worth or importance of something; to consider something valuable
valueless
Having no value; worthless