Word

[Sarah]

1. well said
   2)said in a agreement
2. can be used as a greeting, hey whats up

[Donald Trump]

Word is the shortened form of the phrase: my word is my bond which was originated by inmates in U.S. prisons. The longer phrase was shortened to word is bond before becoming word, which is most commonly used. It basically means truth. Or to speak the truth.

[Sonia]

A versatile declaration, originating (more or less) in hip-hop culture.
Word has no single meaning, but is used to convey a casual sense of affirmation, acknowledgement, agreement, or to indicate that something has impressed you favorably.
Its usage among young blacks has been parodied ad nauseam among clueless suburban whites.

[Britney]

I concur, my fellow African American friends.

[Little_Girl]

Affirmative.
Can also be used as a question, meaning really?

[Rihanna]

I agree. can be used to express agreement and approval in several ways.

[Mark Zuckerberg]

to concur

[Becky]

True, an affirmation.

[Dianne]

Denoting a slang word, or one that may be offensive or have a negative connotation, specified by the words first letter.

[Sommer]

A single distinct meaningful element of speech or writing, used with others (or sometimes alone) to form a sentence and typically shown with a space on either side when written or printed.