Repeatedly means doing something over and over again, multiple times. When your teacher asks you repeatedly to turn in your homework, she's asked you many times: she's reminded you again and again. When a basketball player practices free throws repeatedly, he shoots shot after shot, working on the same skill through constant repetition.

The word suggests frequent occurrence. If something happens repeatedly, it keeps happening: the alarm clock rings repeatedly until you finally wake up, or a younger sibling asks repeatedly if you can play with them. Sometimes repeatedly means the action happens so often it becomes annoying or tiresome, like when you've explained the rules of a game repeatedly but someone still doesn't seem to get it.

Scientists often test their experiments repeatedly to make sure their results are accurate, not just lucky accidents. Athletes practice moves repeatedly until they become automatic. This kind of repetition (the noun form) is how people master difficult skills: by doing them over and over until they become second nature.