Definitions For Assumption

The act of taking possession of or power over something
The act of assuming or taking for granted
Audacious (even arrogant) behavior that you have no right to
A hypothesis that is taken for granted
A statement that is assumed to be true and from which a conclusion can be drawn
(Christianity) the taking up of the body and soul of the Virgin Mary when her earthly life had ended
Celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Dormition in the Eastern Orthodox Church

Is Assumption a Scrabble Word?

Words With Friends YES

Scrabble US YES

Scrabble UK YES

English International (SOWPODS) YES

Scrabble Global YES

Enable1 Dictionary YES

Scrabble

Words with Friends

The word Assumption is worth 14 points in Scrabble and 18 points in Words with Friends

I made the assumption that he was coming, so I was surprised when he didn't show up.
He will come home tomorrow. At least, that's my assumption.
Many scientific assumptions about Mars were wrong.