Άντε in modern Greek means “come on”, “go”.
It is informal and we use it when we want to urge someone to do something.
Example:
Άντε ντύσου, είναι ώρα να φύγουμε! = Come on, get dressed it's time to leave!
Άιντε is an older form, which is also used nowdays.
Etymology:
Άιντε actually comes from the ancient άγετε. Άγετε is imperative of the ancient Greek verb άγω which means “walk”, “march”.
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.