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'sign' - used as an adjective
Synonyms for 'sign'
1. used of the language of the deaf

'sign' - used as a noun
2. a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
he showed signs of strain
they welcomed the signs of spring
3. a public display of a (usually written) message
he posted signs in all the shop windows
4. any communication that encodes a message
5. structure displaying a board on which advertisements can be posted
6. (astrology) one of 12 equal areas into which the zodiac is divided
7. (medicine) any objective evidence of the presence of a disorder or disease
there were no signs of asphyxiation
8. having an indicated pole (as the distinction between positive and negative electric charges)
charges of opposite sign
9. an event that is experienced as indicating important things to come
it was a sign from God
10. a gesture that is part of a sign language
11. a fundamental linguistic unit linking a signifier to that which is signified
12. a character indicating a relation between quantities
don't forget the minus sign

'sign' - used as a verb
13. mark with one's signature; write one's name (on)
She signed the letter and sent it off
Please sign here
14. approve and express assent, responsibility, or obligation
Have you signed your contract yet?
15. be engaged by a written agreement
He signed to play the casino on Dec. 18
The soprano signed to sing the new opera
16. engage by written agreement
They signed two new pitchers for the next season
17. communicate silently and non-verbally by signals or signs
He signed his disapproval with a dismissive hand gesture
18. place signs, as along a road
sign an intersection
This road has been signed
19. communicate in sign language
I don't know how to sign, so I could not communicate with my deaf cousin
20. make the sign of the cross over someone in order to call on God for protection; consecrate

derived forms
1. Sign / Plural
2. Sign / Past
3. Sign / Third Person
4. Sign / Present Participle
The following are synonyms for 'sign'. Click on any of them to get both Bibliodata's full list of common definitions and a further set of synonyms.
See also
Past Words of the day
Who Said that ?
The aim of art is to represent not the outward appearance of things, but their inward significance. - Click here to find out.
Fact of the day
The town with the most stop signs per capita than any other in the US: LaConner, Washington