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sign (n):
structure displaying a board on which advertisements can be posted
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the highway was lined with signboards

sign (n):
a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
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he showed signs of strain.
they welcomed the signs of spring

sign (n):
any nonverbal action or gesture that encodes a message
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signals from the boat suddenly stopped

sign (n):
a public display of a message
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he posted signs in all the shop windows

sign (n):
a character indicating a relation between quantities
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don't forget the minus sign

sign (n):
a gesture that is part of a sign language

sign (n):
a fundamental linguistic unit linking a signifier to that which is signified
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The bond between the signifier and the signified is arbitrary

sign (n):
an event that is experienced as indicating important things to come
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he hoped it was an augury.
it was a sign from God

sign (n):
(astrology) one of 12 equal areas into which the zodiac is divided

sign (n):
having an indicated pole (as the distinction between positive and negative electric charges)
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he got the polarity of the battery reversed.
charges of opposite sign

sign (n):
(medicine) any objective evidence of the presence of a disorder or disease
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there were no signs of asphyxiation

sign (v):
place signs, as along a road
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sign an intersection.
This road has been signed

sign (v):
make the sign of the cross over someone in order to call on God for protection; consecrate

sign (v):
be engaged by a written agreement
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He signed to play the casino on Dec. 18.
The soprano signed to sing the new opera

sign (v):
communicate in sign language
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I don't know how to sign, so I could not communicate with my deaf cousin

sign (v):
mark with one's signature; write one's name (on)
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She signed the letter and sent it off.
Please sign here

sign (v):
communicate silently and non-verbally by signals or signs
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He signed his disapproval with a dismissive hand gesture.
The diner signaled the waiters to bring the menu

sign (v):
engage by written agreement
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They signed two new pitchers for the next season

sign (v):
approve and express assent, responsibility, or obligation
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All parties ratified the peace treaty.
Have you signed your contract yet?

sign (s):
used of the language of the deaf

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