1375-1425;late Middle English (noun) < Latinconflīctus a striking together, equivalent to conflīg(ere) to strike together, contend (con-con- + flīgere to strike) + -tus suffix of v. action; (v.) < Latinconflīctus, past participle of conflīgere, or by v. use of the noun
c.1430, from L. conflictus, pp. of confligere "to strike together," from com- "together" + fligere "to strike" (see afflict). The noun also dates from mid-15c. Psychological sense of "incompatible urges in one person" is from 1859 (hence conflicted, pp. adj.); Phrase conflict of interest was in use by 1743.