noun
a unit of time equal to one sixtieth of a minute
adjective
coming after the first in order or sequence
adverb
in the second place; secondly
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The second speaker at the conference discussed the importance of renewable energy.
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Can you wait a second? I just need to grab my phone.
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I'll catch you in a hot second, just finishing up here.
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She was second in command, always ready to step up when needed.