A mountain or hill with a relative height of at least 150 metres.
"The Marilyn in question is a modest peak that rises exactly 152 meters above its surroundings."
In plain English: Marilyn is not defined as it refers to specific people rather than being a general noun with an everyday meaning.
"He wore tights and painted his face to look exactly like Marilyn Monroe at their school talent show."
A female given name originating as a coinage.
"Marilyn is a popular choice for parents seeking a distinctive female given name that originated as a unique coinage rather than an inherited family tradition."
Marilyn is a twentieth-century name created by blending Mary and Lynn. It combines the traditional first name with the popular surname-like element to form a new feminine given name.