(computing) A computer-human interaction in which either the computer or the human can take initiative and decide what to do next.

Beyond imitation, surpassing all others; matchless.

(uncountable) Deviation from what is right; gross injustice, sin, wickedness. / (countable) An act of great injustice or unfairness; a sinful or wicked act; an unconscionable deed.

(US) (rare) Inimical (harmful, hostile).

Serving to initiate; inceptive; initiatory; introductory; preliminary. / In which voter initiatives can be brought to the ballot.

A beginning; a first move. / A new development; a fresh approach to something; a new way of dealing with a problem. / The ability to act first or on one's own.

(historical) A system proposed by U.S. President Ronald Reagan on March 23, 1983, to use ground-based and space-based systems to protect the United States from attack by strategic nuclear ballistic missiles.

plural of iniquity

(anatomy) A small protuberance on the external surface of the back of the skull near the neck; the external occipital protuberance.

(obsolete) Inimical; unfriendly, hostile.