IPA: /ˈrɪð.əm.ɪ.kli/
KK: /ˈrɪðəmɪkli/
In a way that follows a regular pattern of sounds or movements.
The dancers moved rhythmically to the music, creating a beautiful performance.
Rhythmically → It is formed from "rhythm" (from Greek "rhythmos", meaning measured flow or movement) and "-ically" (meaning in a manner relating to). The word "rhythmically" means in a manner that relates to or is characterized by rhythm.
Think of the word 'rhythm' which refers to a measured flow, and remember that 'rhythmically' means doing something in a way that follows that flow.