## Meanings
1. A board or notice that gives information, directions, or a warning.
2. Something that shows that something else exists or is happening.
3. A movement or gesture used to communicate a message.
4. To write your name on something to agree to it or make it official.

## Examples
- I posted signs in all the shop windows.
- We showed signs of strain after thirty hours of travel.
- She gave me a sign to keep quiet.
- Please sign at the bottom of the form.

## Derived Forms
- aftersign
- autosign
- biosign
- callsign
- co-sign
- codesign
- cosign
- countersign
- dreamsign
- e-sign
- fansign
- foresign

## Related Forms
- signage
- signal
- signaletic
- signatory
- signature
- signet
- signify

## Roots and Affixes
- Root: signen
- Root: seġnian
- Root: en
- Root: signare
- Root: signum

## Etymology
From Middle English signen, seinen, seinien, partly from Old English seġnian (“to mark; sign”) and partly from Anglo-Norman seigner, seiner et al., Old French signer et al., and their source Latin signāre (“to mark, seal, indicate, signify”); all from Latin signum (“a mark, sign”); see Etymology 1, above. Compare sain.

## AI Etymology
Sign is from Middle English signen, seinen, seinien, partly from Old English seġnian (“to mark; sign”) and partly from Anglo-Norman seigner, seiner et al., Old French signer et al., and their source Latin signāre (“to mark, seal, indicate, signify”); all from Latin signum (“a mark, sign”); see Etymology 1, above. Compare sain. Important forms in the word's history include Middle English signen, Old English seġnian, xno en, Latin signare, Latin signum. In current use it includes senses such as A board or notice that gives information, directions, or a warning and Something that shows that something else exists or is happening.

## Topics
- Communication

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