veg·e·tate / ˈvejəˌtāt/ • v. [intr.] 1. live or spend a period of time in a dull, inactive, unchallenging way: if she left him there alone, he'd sit in front of the television set and vegetate. 2. dated (of a plant or seed) grow; sprout. ∎ [tr.] cause plants to grow in or cover (a place).3. Med. (of an abnormal growth) increase in size.