What does the prefix "anti-" signify?

The prefix "anti-" originates from Greek, meaning "against" or "opposite." It is commonly used in various terms across different fields, including medicine, biology, and politics, to indicate a position or action that opposes or counters something. For example, "antibiotic" refers to a substance that works against bacteria, and "antifungal" refers to agents that combat fungal infections. This prefix effectively conveys a sense of opposition, making it clear that something labeled with "anti-" is intended to counteract an existing condition or entity.