1. without official authorization; - Example: "he had made some money on the side" [syn: unofficially, on the side]
2. not in an official capacity; - Example: "unofficially, he serves as the treasurer"
WordNet (r) 3.0 (2006):
unofficially
adv 1: without official authorization; "he had made some money
on the side" [syn: unofficially, on the side]
2: not in an official capacity; "unofficially, he serves as the
treasurer" [ant: officially]