C15: from Late Latin combīnāre, from Latin com- together + bīnī two by two
Word Origin and History for combined
combine
v.
early 15c., from Middle French combiner (14c.), from Late Latin combinare "to unite, yoke together," from Latin com- "together" (see com-) + bini "two by two," adverb from bi- "twice" (see binary). Related: Combinative; combined; combining.
n.
"machine that cuts, threshes and cleans grain" (short for combine harvester), 1857, from combine (v.).