The noun tune has 3 senses (first 1 from tagged texts)
1. (12) tune, melody, air, strain, melodic line, line, melodic phrase -- (a succession of notes forming a distinctive sequence; "she was humming an air from Beethoven")
2. tune -- (the property of producing accurately a note of a given pitch; "he cannot sing in tune"; "the clarinet was out of tune")
3. tune -- (the adjustment of a radio receiver or other circuit to a required frequency)
Overview of verb tune
The verb tune has 2 senses (first 1 from tagged texts)
1. (1) tune, tune up -- (adjust for (better) functioning; "tune the engine")
2. tune, tune up -- (adjust the pitches of (musical instruments); "My piano needs to be tuned")