- parallel (adj.)
- 1540s, from Middle French parallèle (16c.) and directly from Latin parallelus, from Greek parallelos "parallel," from para allelois "beside one another," from para- "beside" (see para- (1)) + allelois "each other," from allos "other" (see alias). As a noun from 1550s. Parallel bars as gymnastics apparatus are recorded from 1868.
- parallel (v.)
- 1590s, from parallel (n.).