a person who is opposed (to an action or policy or practice etc.)
"the antis smelled victory after a long battle"
A person opposed to a concept or principle.
"The anti-war protesters gathered outside the government building to demand an immediate end to the conflict."
In plain English: An anti is someone who strongly opposes or argues against a particular idea or person.
"The anti showed their support by holding up signs during the rally."
Usage: Use "anti" only as an adjective placed before a noun, such as "an anti-smoking campaign," rather than as a standalone noun referring to a person. Referring to a person who opposes something requires using the full word "opponent" or a specific term like "activist."
not in favor of (an action or proposal etc.)
"The local residents were anti-development, so they gathered to protest the new factory plans."
Opposed to something.
"The group gathered outside to protest against the new policy, showing their clear opposition to it."
In plain English: Anti means being against something or opposing it.
"I prefer anti-lock brakes for better safety in wet weather."
Usage: Use "anti-" only when describing a person or group that actively opposes an idea, policy, or movement, not simply someone who dislikes it. Do not use it before nouns like "virus" or "socialism" unless you specifically mean those opposing the concept itself rather than just being affected by it.
Alternative form of anti-
"The dictionary lists both "antibiotic" and "antibiotic" as acceptable spellings for that alternative form of anti-."
The word anti began as a Greek prefix meaning "against." It traveled into English to function both as that same opposing force and as an independent adjective describing something contrary or hostile.