a way of acting or behaving
"Her cheerful manner made everyone feel welcome at the party."
Mode of action; way of performing or doing anything
"She apologized for her rude manner of speaking during the meeting, even though she was trying to be helpful."
In plain English: Manner is the specific way someone does something or behaves toward others.
"She greeted everyone with a friendly manner."
Usage: Use "manner" to describe the specific way in which an action is performed or something is done. It often refers to style, demeanor, or method rather than just the act itself.
A surname.
"Her aunt, Mrs. Manner, always insisted on serving tea at exactly four o'clock."
The word "manner" comes from Old French maniere, which originally meant something belonging to the hand or a handle in Latin. It entered English via Anglo-Norman with this same sense of manual connection before evolving into its current meaning.