What is the meaning of Anti-?

Against, opposed to.

Counteracting, neutralizing.

The opposite of what is typically expected.

Physically opposite, reverse in position or direction.

A rival or counterpart to.

Composed of antimatter.

Reacting with immunoglobins found in the specified animal.

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anti-, contra-, counter- (for use mainly in scientific terms)

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anti- (related to antiparticles or antimatter)

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anti-; against, opposite, protecting against

anti-; against, opposite, protecting against

Source: wiktionary.org