(a.) Having the same bounds, or limits; bordering upon; contiguous.

accompanying adjacent adjoining agreeing bordering buck coetaneous coeternal coeval coexistent coexisting coinstantaneous collateral combat concomitant concurrent connecting contemporaneous contemporary contend contiguous coterminous dispute duel end to end endeavor endways endwise face to face fight immediate isochronal isochronous joined juxtaposed neighbor neighboring next oppose repel rival simultaneous traverse unison unisonous vie withstand