Initialism of computer-assisted language learning.

To shout out in order to summon (a person). / To ask for in a loud voice. / (figuratively) To request, demand. / To necessitate, demand. / To stop at a place and ask for (someone).

A telephone conversation; a phone call. / An instance of calling someone on the telephone. / A short visit, usually for social purposes. / (nautical) A visit by a ship or boat to a port.

(intransitive) To request, summon, or beckon. / (intransitive) To cry or shout. / (transitive) To utter in a loud or distinct voice. / (transitive, intransitive) To contact by telephone.

(attributive) on call

(obsolete) available when requested

(idiomatic, transitive) To visit (a person); to pay a call to. / (idiomatic, transitive) To select (a student in a classroom, etc.) to provide an answer.

Available to be summoned.

(intransitive, copulative) To communicate with a base etc, by telephone. / (transitive) To report; communicate (a message) by telephone or similar. / (intransitive) To pay a short visit.

(of a TV or radio programme) In which members of the public telephone the studio and talk live to the presenter.