Which prefix means against?

Which prefix means against?

• A. Anti-
• B. A-
• C. Re-
• D. Acu-

Answer: (A)

The concept relies on how prefixes modify meaning, with some indicating opposition. The prefix that means against is anti-. It signals opposing or preventing something, as in antibiotic (against bacteria) or antiseptic (against infection). The other prefixes don’t convey opposition. A- often means not or without (as in atypical, amoral). Re- means again or back (redo, rewrite). Acu- relates to sharpness or needles (acute, acupuncture), not opposition. So the correct choice is the prefix that directly expresses opposition: anti-.

The concept relies on how prefixes modify meaning, with some indicating opposition. The prefix that means against is anti-. It signals opposing or preventing something, as in antibiotic (against bacteria) or antiseptic (against infection).

The other prefixes don’t convey opposition. A- often means not or without (as in atypical, amoral). Re- means again or back (redo, rewrite). Acu- relates to sharpness or needles (acute, acupuncture), not opposition.

So the correct choice is the prefix that directly expresses opposition: anti-.