adj.
- Absorbed in thought; engrossed.
- Excessively concerned with something; distracted.
- Formerly or already occupied.
- Already used and therefore unavailable for further use. Used of taxonomic names.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.