guess

v. 1 (often absol.) Estimate without calculation or measurement. 2 form a hypothesis or opinion about; conjecture; think likely. 3 conjecture or estimate correctly. 4 (foll. By at) make a conjecture about. n. Estimate, conjecture.  i guess colloq. I think it likely; i suppose. [origin uncertain]

v. t. To form an opinion concerning, without knowledge or means of knowledge; to judge of at random; to conjecture.