To make something equal in quantity, size, or degree throughout a place or group. The government introduced new policies to equalise educational opportunities across the country.
To make the score of a game or competition equal. The team managed to equalise in the last minute of the match, bringing the score to 2-2.
To become equal or level, especially after a difference in quantity, pressure, or temperature. The air pressure in the cabin equalised shortly after take-off.
To adjust the frequency balance of an audio signal, typically using an equaliser. She equalised the vocal track to remove unwanted mid-range resonance.