parameter
Definitions
A measurable factor that defines a system or sets its conditions.
参数，参量（定义系统或设定其条件的可测因素）。
A limit or boundary that defines the scope of something (usually plural).
界限，范围（常用复数）。
Root Breakdown
Root-derivedpara- (beside, alongside) + meter (measure) = a measure 'set alongside' something to define or limit it. From this come both the math sense (a defining variable) and the everyday sense ('within the parameters' = within the set limits).
Root meter still carries 9 more wordsWhy It Means This
Parameter is the family's tricky member. Its 'measure alongside' origin is the key: a parameter is a boundary measure that frames a problem. In statistics or programming it's a variable you set; in plain English 'the parameters of the discussion' are the limits within which it must stay. Both senses come from drawing a measuring line beside something to fix its scope.
Usage Guide
Don't confuse 'parameter' (a defining factor or limit) with 'perimeter' (a physical boundary line). 'Within the parameters of the budget' = within the budget's limits, not its edge. In tech, a 'parameter' is a value passed to a function.
Example Sentences
- 1.
Cost and time are the main parameters of the project.
- 2.
We must work within the parameters set by the law.
- 3.
The function takes two parameters as input.
Easily Confused
parameter vs perimeter — they sound alike but differ: a perimeter is a physical edge or boundary you can walk around; a parameter is an abstract limit or defining factor. You secure a perimeter; you set a parameter.