A thought or a consideration offered in support of a determination or an opinion; a just ground for a conclusion or an action; that which is offered or accepted as an explanation; the efficient cause of an occurrence or a phenomenon; a motive for an action or a determination; proof, more or less decisive, for an opinion or a conclusion; principle; efficient cause; final cause; ground of argument.
- The basis or motive for an action, decision, or conviction. See Usage Notes at because, why.
- A declaration made to explain or justify action, decision, or conviction: inquired about her reason for leaving.
- An underlying fact or cause that provides logical sense for a premise or occurrence: There is reason to believe that the accused did not commit this crime.
- The capacity for logical, rational, and analytic thought; intelligence.
- Good judgment; sound sense.
- A normal mental state; sanity: He has lost his reason.
- Logic A premise, usually the minor premise, of an argument.
- To use the faculty of reason; think logically.
- To talk or argue logically and persuasively.
- Obsolete To engage in conversation or discussion.
- To determine or conclude by logical thinking: reasoned out a solution to the problem.
- To persuade or dissuade (someone) with reasons.
- by reason of Because of.
- in reason With good sense or justification; reasonably.
- within reason Within the bounds of good sense or practicality.
- with reason With good cause; justifiably.