verb

1. To authenticate by means of belief; to surmise; to suppose to be true, especially without proof

   "We assume that, as her parents were dentists, she knows quite a bit about dentistry."

2. To take on a position, duty or form

   "Mr. Jones will assume the position of a lifeguard until a proper replacement is found."

3. To adopt a feigned quality or manner; to claim without right; to arrogate

   "He assumed an air of indifference"

4. To receive, adopt (a person)

5. To adopt (an idea or cause)