Definitions:
a word or phrase used to describe a thing or to express a concept, especially in a particular kind of language or branch of study

a fixed or limited period for which something, for example office, imprisonment, or investment, lasts or is intended to last

each of the periods in the year, alternating with holiday or vacation, during which instruction is given in a school, college, or university, or during which a law court holds sessions

conditions under which an action may be undertaken or agreement reached; stipulated or agreed requirements

each of the quantities in a ratio, series, or mathematical expression.

give a descriptive name to; call by a specified term