Word origin
[1560–70; ‹ L
coapt(
āre), equiv. to
co- co- +
aptāre to put into position, v. deriv. of
aptus apt]This word is first recorded in the period 1560–70. Other words that entered Englishat around the same time include: bulb, ellipsis, identity, radial, vertexco- is a prefix meaning “with,” “together,” “in association,” sometimes with the derivedsense “auxiliary, subsidiary” (coenzyme; copilot), and, in mathematics and astronomy, with the sense “complement” (codeclination)