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.

Obsolete form of ante-.

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

anti-

1. against, opposed to
2. counteracting, neutralizing
3. the opposite of what is typically expected
4. physically opposite, reverse in position or direction
5. a rival or counterpart to
6. composed of antimatter
8. reacting with immunoglobins found in the specified animal

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

anti-

ante-

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anti- (related to antiparticles or antimatter)

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anti-; against, opposite, protecting against

anti-; against, opposite, protecting against

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Source: wiktionary.org