tune1 S3 [countable]
a series of musical notes that are played or sung and are nice to listen to [= melody]:
Sam was humming a little tune.
a hymn tune
The song is sung to the tune of Colonel Bogey.
playing or singing the correct musical note:
They sang perfectly in tune.
playing or singing higher or lower than the correct musical note:
Greg's bass guitar was out of tune.
able or unable to realize, understand, or agree with what someone else thinks or wants:
The industry is changing in tune with changing demand.
used to emphasize how large an amount or number is:
Canada is funding the programme to the tune of $30 million.