n.
1.a constant in the equation of a curve that can be varied to yield a family of similar curves
2.any factor that defines a system and determines (or limits) its performance
3.a quantity (such as the mean or variance) that characterizes a statistical population and that can be estimated by calculations from sample data
Idiom of the Day
keep track of (someone or something)
to maintain a record of something
"Please carefully keep track of your expenses during the trip."
