noun
plural -ers
[count] :a female parent
[count] :a woman who is thought of as being like a mother
[count] :a woman who invents or begins something - usually singular
[singular] :a cause or origin of something
[count] :mother superior - used especially as a title or as a form of address
[singular] informal - used to say that something is larger, better, worse, etc., than all other things of the same kind
[count] US offensive :motherfucker
learn (something) at your mother's knee
necessity is the mother of invention
used to say that new ways to do things are found or created when there is a strong and special need for them;
verb
-ers; -ered; -ering
[+ obj] to give birth to (a child)
to be or act as mother to (someone) :to care for or protect (someone) like a mother