Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class I. Words Expressing Abstract Relations
Section VIII. Causation
5. Combinations of Causes

178. Concurrence.

   NOUN:CONCURRENCE, coöperation, coagency; union; coadunation, coaction [rare], coworking [rare], synergy [rare], collaboration, conformity, conformableness, agreement [See Agreement]; consilience; consent (assent) [See Assent]; alliance; concert [See Coöperation]; partnership [See Party].
   VERB:CONCUR, conduce, conspire, contribute; agree, unite, harmonize, hitch [colloq.], jibe [colloq., U. S.], coadunate, combine; hang -, pull- together &c. (coöperate) [See Coöperation]; help to (aid) [See Aid].
  keep pace with, run parallel; go with, go along with, go hand in hand with.
   ADJECTIVE:CONCURRING &c. v.; concurrent, conformable, corresponsive [rare], joint, coöperative, concomitant, coincident, concordant, harmonious, consentaneous [archaic]; coadunate, coadunative, consilient, in alliance with, banded together, of one mind, at one with.
   ADVERB:with one consent.