mid-13c. (trans.), c.1300 (intrans.), from O.Fr. assembler
(11c.), from L. assimulare
"to make like, think like," later "to gather together," from ad-
"to" + simulare
"to make like" (see simulation
). In 14c. it also was a euphemism for "to couple sexually." Assemble together
is redundant. Meaning "to put parts together" in manufacturing is from 1852.