also co-ordination, c.1600, "orderly combination," from French coordination (14c.) or directly from Late Latin coordinationem (nominative coordinatio), noun of action from past participle stem of Latin coordinare "to set in order, arrange," from com- "together" (see com-) + ordinatio "arrangement," from ordo "order" (see order (n.)). Meaning "action of setting in order" is from 1640s; that of "harmonious adjustment or action," especially of muscles and bodily movements, is from 1855.
The use of grammatical structures to give equal emphasis to, or to “coordinate,” two or more words, groups of words, or ideas: “I like eggs and toast.” In the following sentences, each clause receives equal emphasis: “Mr. Jones teaches French, and Ms. Williams teaches English”; “Mr. Jones teaches French, but Ms. Williams teaches English.” (Comparesubordination.)