Definitions of guess:

• noun:   an estimate based on little or no information
• noun:   a message expressing an opinion based on incomplete evidence
• verb:   guess correctly; solve by guessing

  Example: "He guessed the right number of beans in the jar and won the prize"

• verb:   put forward, of a guess, in spite of possible refutation

  Example: "I am guessing that the price of real estate will rise again"

• verb:   judge tentatively or form an estimate of (quantities or time)
• verb:   expect, believe, or suppose

  Example: "I guess she is angry at me for standing her up"

• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4499)