A lot vs. Alot: 9 Grammatical Pitfalls
late 14c., "process of understanding, reasoning, thought," from French discours, from Latin discursus "a running about," in Late Latin "conversation," from past participle stem of discurrere "run about," from dis- "apart" (see dis-) + currere "to run" (see current (adj.)). Sense of "formal speech or writing" is first recorded 1580s.
1540s, from discourse (n.). Related: Discoursed; discoursing.