(slang) A generator (device that converts mechanical to electrical energy).

(obsolete, UK, slang) A shilling.

(informal) A generation (group of people born in a specific range of years). / (informal) A specific version of something in a chronological sequence.

(chiefly Britain, informal) Information. / (birdwatching) Information about the location of a bird. / (fandom slang) Fan fiction that does not specifically focus on romance or sex.

To generate using an automated process, especially a computer program.

Alternative letter-case form of Gen (“member of the Gen Movement”)

(taxation, US) Initialism of group exemption number.

(Internet slang, tone indicator) Denotes that the preceding question is genuine, as opposed to rhetorical.

(Ancient Rome, historical) A legally defined unit of Roman society, being a collection of people related through a common ancestor by birth, marriage or adoption, possibly over many generations, and sharing the same nomen gentilicium.

plural of gen (clipping of generation).