Most of the time; less than always, but more than occasionally.
"She usually arrives at work by 9 a.m., though she's known to be late on rainy days."
In plain English: Usually means something happens most of the time, but not always.
"She usually arrives at work before eight in the morning."
Usage: Use usually to indicate that something happens most of the time without implying it is an absolute rule like always or never. Place this adverb before main verbs and after forms of "to be" for correct grammar in standard sentences.
The word usually comes from the combination of the words usual and ly, which was borrowed into Middle English. It eventually replaced an older native form that had a similar meaning in Old English.