Synonyms for custom

noun

1. A habitual action

   habit, practice, usage, wont, fashion, routine, precedent, use, habitude, form, consuetude, addiction, rule, procedure, manner, observance, characteristic, second nature, matter of course, beaten path*, rut*; see also method 2, system 2.

   Antonyms irregularity, strangeness*, newness.

2. A traditional action

   manner, way, mode, method, system, style, vogue, fashion, convention, habit, rule, practice, precedent, formality, form, mold, established way of doing things, pattern, design, type, taste, character, routine, ritual, rite, ceremony, attitude, immemorial usage, observance, social usage, mores, dictates of society, familiar way, unwritten law, etiquette, conventionality, second nature, conventionalism, matter of course; see also tradition 1.

   Antonyms deviation, departure*, shift.

3. The whole body of tradition

   inheritance, folkways, mores; see culture 2. See syn. study at habit.