Also means
anti (prefix)
Usage Note
Anti functions as a standalone noun meaning a person opposed to something (los antis bloquearon la propuesta = the opponents blocked the proposal), but it is far more productive as a prefix attached to nouns and adjectives: antiaéreo, anticorrupción, antivirus. When prefixed, no hyphen is used in modern Spanish orthography unless the base word is a proper noun.
Examples
"Los antis de la reforma se reunieron fuera."
Natural Translation
The opponents of the reform gathered outside.

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