I. adjective
1.
Synonyms: intermittent , isochronal, isochronous, periodic, periodical, recurrent, recurring
Related Word: alternant, alternating, rotating; complementary, corresponding, reciprocal
Contrasted words: sequent, successive
Antonyms: consecutive
2.
Synonyms: substitute 1, alternative, backup, surrogate
Related Word: equivalent, proxy, replacing; exchangeable, interchangeable; makeshift, provisional, tentative
II. verb
Synonyms: rotate 2
Related Word: fluctuate, oscillate, sway, waver; recur, return, revert
Contrasted words: follow, succeed
III. noun
Synonyms: substitute 1, backup, fill-in, locum tenens, pinch hitter, replacement, stand-in, sub, succedaneum, surrogate