n. The quality of being alert or on the alert; briskness; nimbleness; activity.
the GNU version of the Collaborative International Dictionary of English
n. The quality of being alert or on the alert; briskness; nimbleness; activity.
The Century Dictionary and Cyclopedia
n. The state or quality of being alert; briskness; nimbleness; activity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a state of readiness to respond
n. the process of paying close and continuous attention
n. lively attentiveness
Word Usage
"The undead we encountered were a nice exercise in alertness, because some of them were invisible, and as we fought our way through them up to the parapet where the questgiver waited for us, I admired our solid teamwork."