There are 2 definitions of yo in English:

yo1

Syllabification: yo

exclamation

informal
Used to greet someone, attract their attention, or express excitement.

Origin

natural exclamation: first recorded in late Middle English.

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Word of the day semblance
Pronunciation: ˈsɛmbləns
noun
the outward appearance or apparent form of something…

There are 2 definitions of yo in English:

yo2

Syllabification: yo

pronoun

nonstandard spelling of you, used to represent black English.

adjective

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nonstandard spelling of your, used to represent black English.

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Definition of yo in: