I. sixth 1 /sɪksθ/ BrE AmE adjective
coming after five other things in a series:
her sixth birthday
the sixth century
—sixth pronoun :
Let’s have dinner on the sixth (=the sixth day of the month) .
II. sixth 2 BrE AmE noun [countable]
one of six equal parts of something:
About one sixth of the children admitted to taking drugs.