co-opt v.

word-forming element usually meaning "with, together," from Latin com, archaic form of classical Latin cum "together, together with, in combination," from PIE *kom- "beside, near, by, with" (compare Old English ge-, German ge-). The prefix in Latin sometimes was used as an intensive.

Before vowels and aspirates, it is reduced to co-; before -g-, it is assimilated to cog- or con-; before -l-, assimilated to col-; before -r-, assimilated to cor-; before -c-, -d-, -j-, -n-, -q-, -s-, -t-, and -v-, it is assimilated to con-, which was so frequent that it often was used as the normal form.

c. 1600, "action of choosing;" 1630s, "power or liberty of choosing," from French option (Old French opcion), from Latin optionem (nominative optio) "choice, free choice, liberty to choose," from optare "to desire, pray for, choose," which is of uncertain origin. De Vaan derives it from Proto-Italic *opeje- "to choose, grab," from PIE *hopeie- "to choose, grab," and compares Hittite epp/app- "to take, grab," Sanskrit apa, Avestan apa "has reached."

The meaning "thing that may be chosen" is attested from 1885. The commercial transaction sense of "privilege secured by payment of a premium (on a stock or a certain produce at a specified time and at a specified price)" is recorded from 1755 (the verb in this sense is attested by 1880 in American English). As a North American football play in which the back may either pass the ball or run with it, it is recorded by 1953.

see co-opt.