A girl or unmarried woman who assists the bride at a wedding.

A married woman who assists the bride at a wedding.

plural of error of the second kind

(statistics) type II error

(statistics) type I error

plural of error of the first kind

Variety is what makes life interesting.

(business) The executive who is in charge of financial affairs, notably as head of a financial department, typically directly under the chief executive officer and/or the board who lead the corporation or other organisation as a whole

(idiomatic) The period of one's mature life when one is at a peak of health and performance.

plural of blade of grass