Definitions
1.nounThe time of day when a radio or television station begins broadcasting, usually after being off the air for several hours."Sign on for the radio station is at 5 a.m."
2.verbTo join something, after signing.
3.verbTo commit oneself, as to a project, a goal, on organization, a cause."I never signed on for this."
4.verbTo begin broadcasting a radio or television signal, usually at the beginning of a broadcasting day and after being off the air for several hours."Years ago, the TV station would sign on at 5 a.m., but now it broadcasts 24 hours a day."
5.verbTo log on; to start using a computer, radio, etc., or to start talking.
6.verbTo apply to receive unemployment benefits.
7.nounThe username and password for logging in to a computer account.
8.nounAn attempt to log in.
9.noun(more generally) An instance of signing on to something.
10.nounA person who signs on to something.
11.nounA verbal script that is repeated at the start of every instance of something, as a form of greeting and identification.
12.nounA signing bonus.