Prefix meaning opposed, against. For instance, the prefix contra- gave rise to the words contra dict and contra st, whereas the variant spelling counter- gave rise to counter act and counter feit. The Dictionary.com Word Of The Year For 2020 Is …. See also: counter-. Prefix Meaning Example A-Without/Not Aside, Atheist An-Without/Not Anarchy, Anesthesia Anti-Against Antisocial, Anticlimax Ben-Good Benefit, Benevolence Bi-Two Bicarbonate, Biannual Circum-Around Com-Together Contra