–adjective

1.	operating under the direct control of, or connected to, a main computer.

2.	connected by computer to one or more other computers or networks, as through a commercial electronic information service or the Internet.

3.	of or denoting a business that transmits electronic information over telecommunications lines: an on-line bookstore.

4.	available or operating on a computer or computer network: an on-line dictionary.

5.	by means of or using a computer: on-line shopping.

6.	Radio. (of a network) supplying affiliated stations with all or a substantial part of their programming.

7.	Television. of or pertaining to the final editing of a videotaped program.

8.	done or accomplished while in operation or active service: on-line maintenance.

9.	located on major routes or rail lines: on-line industries.

–adverb

10.	with or through a computer, esp. over a network.

–noun, plural -nos for 1.

1.	a building or large room used for meetings, entertainment, dancing, etc., esp. such a place equipped with gambling devices, gambling tables, etc.

2.	(in Italy) a small country house or lodge.

3.	Also, cassino. Cards. a game in which cards that are face up on the table are taken with eligible cards in the hand.