rounder (n.)

early 14c., "a spherical body; that which has roundness," from round (adj.) and Anglo-French rount and Old French reont, roond. Compare Dutch rond, Danish and Swedish rund, German runde, all nouns from adjectives.

The sense of "dance in which performers move in a circle or ring" is by 1510s. The meaning "large round piece of beef" is recorded from 1650s. The sense of "circuit performed by a sentinel" is from 1590s; hence to go or make one's rounds "pay regular visits" (1680s). The meaning "recurring course of time" is from 1710. Meaning "song sung by two or more, beginning at different times" is from 1520s. Golfing sense attested from 1775; card-playing sense by 1735. Of applause from 1794.

Meaning "quantity of liquor served to a company at one time" is from 1630s; that of "single bout in a fight or boxing match" is from 1812; "single discharge of a firearm" is from 1725. Sense of "recurring session of meetings or negotiations" is from 1964. Theatrical sense (in phrase in the round) in reference to a stage surrounded by the audience is recorded from 1944.  To make the rounds "be passed along by a whole set of persons" is by 1967; the earlier form was go the round (1660s).