presume

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To take for granted as being true in the absence of proof to the contrary: We presumed she was innocent.
2. v. To constitute reasonable evidence for assuming; appear to prove: A signed hotel bill presumes occupancy of a room.
3. v. To venture without authority or permission; dare: He presumed to invite himself to dinner.
4. v. To act overconfidently; take liberties.
5. v. To take unwarranted advantage of something; go beyond the proper limits: Don't presume on their hospitality.
6. v. To take for granted that something is true or factual; suppose: That's the new assistant, I presume.

Century Dictionary and Cyclopedia

1. To take upon one's self; undertake; venture; dare: generally with an infinitive as object.
2. To believe or accept upon probable evidence; infer as probable; take for granted.
3. Synonyms Surmise, Guess, etc. (see conjecture), think, consider.
4. To be venturesome; especially, to venture beyond the limits of ordinary license or propriety; act or speak overboldly.
5. To press forward presumptuously; be led by presumption; make one's way overconfidently into an unwarranted place or position.
6. To take; to take to oneself: with of.

GNU Webster's 1913

1. v. To assume or take beforehand; esp., to do or undertake without leave or authority previously obtained.
2. v. To take or suppose to be true, or entitled to belief, without examination or proof, or on the strength of probability; to take for granted; to infer; to suppose.
3. v. To suppose or assume something to be, or to be true, on grounds deemed valid, though not amounting to proof; to believe by anticipation; to infer.
4. v. To venture, go, or act, by an assumption of leave or authority not granted; to go beyond what is warranted by the circumstances of the case; to venture beyond license; to take liberties; -- often with on or upon before the ground of confidence.

WordNet 3.0

1. v. take upon oneself; act presumptuously, without permission
2. v. take liberties or act with too much confidence
3. v. constitute reasonable evidence for
4. v. take to be the case or to be true; accept without verification or proof