from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The length of time during which a person can concentrate on a subject or idea.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The length of time, or span that one can pay attention, or concentrate on one topic without becoming distracted.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the length of time you can concentrate on some idea or activity
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