A practitioner or supporter of an ism

(law) Initialism of incompetent to stand trial.

(computing) Initialism of InterSwitch Trunk. / Initialism of India Standard Time.

Abbreviation of first.

a person who studies or practices a particular discipline; / a person who uses a device of some kind; / one who engages in a particular type of activity;

plural of ist

Alternative form of first person

“Everything else is the work of man.” “Everything else is a human construct.”

Alternative form of Istvaeones

Forms nouns denoting one who follows a principle; an adept.