Source : WordNet®

on-line
     adj 1: on a regular route of a railroad or bus or airline system;
            "on-line industries" [ant: {off-line}]
     2: connected to a computer network or accessible by computer;
        "an on-line database" [ant: {off-line}]
     3: being in progress now; "on-line editorial projects" [syn: {on-line(a)}]