One who attunes.

(organic chemistry) The zwitterion (2S)-3-(1H-imidazol-4-yl)-2-(trimethylammonio)propanoate related to histidine

The act or process of indicating; an indication.

(slang, African-American Vernacular) Utterly infatuated with someone; completely taken over by romantic interest. / (Australia, slang) Caught doing something illegal or against the rules.