| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | extra; supplementary |
| Synonyms: | accessory, accompanying, additional, adjuvant, appurtenant, attendant, attending, coincident, collateral, concomitant, contributory, incident, satellite, secondary, subordinate, subservient, subsidary |
| Antonyms: | necessary, needed |
| Main Entry: | attendant |
| Part of Speech: | adjective |
| Definition: | being present or related |
| Synonyms: | accessory, accompanying, ancillary, associated, attending, coincident, concomitant, consequent, incident |
| Antonyms: | absent, detached |
| Main Entry: | auxiliary |
| Part of Speech: | adjective |
| Definition: | supplementary |
| Synonyms: | abetting, accessory, adjuvant, ancillary, appurtenant, backup, complementary, contributory, extra, reserve, secondary, spare, subordinate, subservient, subsidiary, supporting |
| Antonyms: | body, main |
| Main Entry: | coincident |
| Part of Speech: | adjective |
| Definition: | concurring, happening together |
| Synonyms: | ancillary, attendant, attending, coinciding, collateral, concomitant, consonant, contemporaneous, contemporary, coordinate, correspondent, incident, satellite, simultaneous, synchronous |
| Main Entry: | collateral |
| Part of Speech: | adjective |
| Definition: | indirect, secondary |
| Synonyms: | accessory, accompanying, added, adjunctive, adjuvant, ancillary, appurtenant, attendant, auxiliary, circuitous, coincident, complementary, concomitant, concurrent, confirmatory, coordinate, corresponding, corroborative, dependent, incident, lateral, not lineal, parallel, related, roundabout, satellite, side, sub, subordinate, subservient, subsidiary, supporting, tributary, under |
| Antonyms: | chief, direct, main, primary, principal |
| Main Entry: | concomitant |
| Part of Speech: | adjective |
| Definition: | contributing, accompanying |
| Synonyms: | accessory, adjuvant, agreeing, ancillary, associated with, associative, attendant, attending, belonging, coefficient, coetaneous, coeval, coexistent, coincident, coincidental, collateral, complementary, concordant, concurrent, conjoined, conjoined with, connected, contemporaneous, contemporary, coordinate, corollary, coterminous, coupled with, fellow, in tempo, in time, incident, isochronal, isochronous, joint, satellite, synchronal, synchronous, synergetic, synergistic |
| Antonyms: | accidental, chance, unrelated |
| Main Entry: | dependent |
| Part of Speech: | adjective |
| Definition: | contingent, determined by |
| Synonyms: | accessory to, ancillary, appurtenant, conditional, controlled by, counting, depending, incidental to, liable to, provisory, reckoning, regulated by, relative, reliant, relying, subject to, subordinate, subservient, susceptible, sustained by, trusting, under control of |
| Antonyms: | free, independent |
| Main Entry: | extra |
| Part of Speech: | adjective |
| Definition: | accessory; excess |
| Synonyms: | added, additional, ancillary, another, auxiliary, beyond, button, extraneous, extraordinary, fresh, further, fuss*, gingerbread, gravy, ice*, in addition, in reserve, in store, inessential, lagniappe, leftover, more, needless, new, one more, optional, other, over and above, perk*, plus, redundant, reserve, spare, special, superfluous, supernumerary, supplemental, supplementary, surplus, tip, unnecessary, unneeded, unused |
| Antonyms: | basic, elementary, essential, fundamental, integral, necessary |
| Main Entry: | incidental |
| Part of Speech: | adjective |
| Definition: | related; minor |
| Synonyms: | accidental, accompanying, adventitious, ancillary, attendant, by-the-way, casual, chance, circumstantial, coincidental, concomitant, concurrent, contingent, contributing, contributory, fluke, fortuitous, irregular, nonessential, occasional, odd, random, secondary, subordinate, subsidiary |
| Antonyms: | basic, essential, fundamental, important, vital |