presumption

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Behavior or attitude that is boldly arrogant or offensive; effrontery.
2. n. The act of presuming or accepting as true.
3. n. Acceptance or belief based on reasonable evidence; assumption or supposition.
4. n. A condition or basis for accepting or presuming.
5. n. Law A conclusion derived from a particular set of facts based on law, rather than probable reasoning.

Century Dictionary and Cyclopedia

1. n. The act of presuming, or taking upon one's self more than good sense and propriety warrant; excessive boldness or over-confidence in thought or conduct; presumptuousness; assurance; arrogance.
2. n. The act of presuming or probably inferring; hypothetical or inductive inference.
3. n. That which is presumed; that which is supposed to be true upon grounds of probability.
4. n. A ground for presuming or believing; evidence or probability, as tending to establish an opinion.
5. n. In law, an inference as to the existence of one fact from the existence of some other fact, founded upon a previous experience of their connection, or dictated by the policy of the law. Presumptions are generally inferences in accordance with the common experience of mankind and the established principles of logic; but, as they differ in cogency or convincing power, the term is used variously as signifying different degrees of certainty in the inference.
6. n. Surmise, Conjecture, etc. See inference.
7. n. Likelihood, probability.

Wiktionary

1. n. the act of presuming, or something presumed
2. n. the belief of something based upon reasonable evidence, or upon something known to be true
3. n. the condition upon which something is presumed
4. n. dated arrogant behaviour

GNU Webster's 1913

1. n. The act of presuming, or believing upon probable evidence; the act of assuming or taking for granted; belief upon incomplete proof.
2. n. Ground for presuming; evidence probable, but not conclusive; strong probability; reasonable supposition.
3. n. That which is presumed or assumed; that which is supposed or believed to be real or true, on evidence that is probable but not conclusive.
4. n. The act of venturing beyond due beyond due bounds; an overstepping of the bounds of reverence, respect, or courtesy; forward, overconfident, or arrogant opinion or conduct; presumptuousness; arrogance; effrontery.

WordNet 3.0

1. n. an assumption that is taken for granted
2. n. a kind of discourtesy in the form of act of presuming
3. n. audacious (even arrogant) behavior that you have no right to
4. n. (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed