If something is rhythmic, it has a strong, repeating beat — a clear rhythm you can feel. Music can be rhythmic; dancing, clapping, running, and even breathing can be rhythmic too. It is the describing word that comes from rhythm. A rhythmic song makes you want to move; rhythmic knocking is knock, knock, knock in a pattern. It is a normal word, a little more careful than street slang, but you will hear it in class, in music, and in sport. Rhythmical means almost the same; rhythmic is the one people say more often.