ad-libbed; ad-libbing
Definition of ad-lib
(Entry 1 of 3)
: to deliver spontaneously
: to improvise especially lines or a speech
ad-lib
adjectiveDefinition of ad-lib (Entry 2 of 3)
: spoken, composed, or performed without preparation
ad lib
adverbDefinition of ad lib (Entry 3 of 3)
1
: in accordance with one's wishes
2
: without restraint or limit
Test Your Vocabulary
Which Word Does Not Belong?
-
- Which of these words does not mean "nonsense"?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share ad-lib
Time Traveler for ad-lib
The first known use of ad-lib was in 1791
See more words from the same year