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“co-operator” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

co-operator
socius: particeps or socius alicujus rei: affinis alicujus rei or alicui rei: adjutor (assistant): minister: administer (who takes or has a subordinate character in the performance of anything, mostly in a bad sense). (the words are found in this connection and order), minister et adjutor; socius et particeps alicujus rei; servus et minister alicujus rei: to be anybody’s co-operator in anything, alicujus socium esse in re: to give anybody a person as his co-operator, alicui dare aliquem ad rem adjutorem.

Quick answer

What is the Latin word for co-operator?
The usual Latin words for “co-operator” are socius, particeps, adiūtor; also minister, administer. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.