Accessory, a. Assisting, aiding, abetting, helping, acceding, additional; supplemental, subservient, subsidiary, subordinate, conducive; accompanying, contributory, auxiliary.
Ant. Essential, inherent; superfluous, irrelevant.
Accident. Chance, disaster, happening, hazard, incident, misfortune, calamity, adventure, casualty, mishap, possibility.
Ant. Certainty, provision, plan, intention, appointment, calculation, law, necessity, purpose, preparation.
Accidental. Casual, unintended, fortuitous, chance; incidental, immaterial, non-essential; occasional, contingent, adventitious.
Ant. Intended, purposed, prepared, appointed, certain.
Acclamation. Applause, cheer, outcry, homage, gratulation, salutation.
Ant. Censure, execration, denunciation, obloquy, sibilation.
Acclivity. Rise, incline, ascent, steep, hill, height.
Ant. Decline, declivity, hollow, descent, depth.