1. Sounding alone; agreeing in pitch. In unison, in harmony.

2. An accordance or coincidence of sounds, proceeding from an equality in the number of vibrations made in a given time by a sonorous body; a single unvaried note; accordance; agreement.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• unioun,
• efison,
• unyson,
• usison,
• unicon,
• incison,
• envison,
• neson,
• unnion,
• penison,
• nisson,
• unsion,
• untion,
• uniion,
• tenison,
• unisome,
• unision,
• unsin,
• anson,
• unpon

• unseeing,
• unsown,
• unsent,
• unsound,
• unkindly,
• unsnarl,
• unsnarled,
• unsanded,
• unseen,
• unkind,
• unsung,
• unkindled,
• unsounded,
• unconcern,
• unsmooth.

The adverb for the word "unison" is "unisonantly".

The adjective form of "unison" is "unisonal" or "unisonant".

The plural form of the word "unison" is "unisons"

The singular form of the word "unison" is "unison". This word does not change its form when referring to a single occurrence or instance.