What is Else ?

Else is (adv) 1. other (used after pronouns) What else can I say? Everyone else had already left. Who else was at the meeting? 2. or else or if not Come in right now, or else stay outside. You must have a ticket, or else you will be thrown off the train by the inspector. you’d better pay, or else if you don’t pay, I’ll hurt you (as informal threat)


source: Easier English, Student Dictionary Upper Intermediate Level