Definition of "alert"
adjective:
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Attentive; awake; on-guard.
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noun:
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An alarm.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A notification of higher importance than an advisory.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To give warning to.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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