"a typesetter engaged in picking up, arranging, and distributing letters or type in a printing office," 1560s, agent noun from past participle stem of Latin componere "to put together, to collect a whole from several parts," from com "with, together" (see com-) + ponere "to place" (past participle positus; see position (n.)).
1630s, "determine by calculation," from French computer (16c.), from Latin computare "to count, sum up, reckon together," from com "with, together" (see com-) + putare "to reckon," originally "to prune," from PIE root *pau- (2) "to cut, strike, stamp." A doublet of count (v.). Related: Computed; computing.
a part separated from adjoining parts by a partition," "1560s, from French compartiment "part partitioned off" (16c.), through Italian compartimento, from Late Latin compartiri "to divide," from com-, here probably as an intensive prefix (see com-), + partis, genitive of pars "a part, piece, a share, a division" (from PIE root *pere- (2) "to grant, allot").