- To deduce is defined as to come up with an answer by logic or by putting pieces of information together.
An example of deduce is when police figure out who the killer is by looking at information they obtain.
transitive verbdeduced, deducing
- to trace the course or derivation of
- to infer by logical reasoning; reason out or conclude from known facts or general principles
Origin of deduceMiddle English deducen ; from Classical Latin deducere, to lead down, bring away ; from de-, down + ducere, to lead: see duct
transitive verbde·duced, de·duc·ing, de·duc·es
- To reach (a conclusion) by reasoning.
- To infer from a general principle; reason deductively: deduced from the laws of physics that the new airplane would fly.
- To trace the origin or derivation of.
Origin of deduceMiddle English deducen, from Latin dēdūcere, to lead away or down : dē-, de- + dūcere, to lead; see deuk- in Indo-European roots.
(third-person singular simple present deduces, present participle deducing, simple past and past participle deduced)
For example, from the premises "all good people believe in the tooth fairy" and "Mary does not believe in the tooth fairy", we deduce the conclusion "Mary is not a good person". This particular form of deduction is called a syllogism. Note that in this case we reach a false conclusion by correct deduction from a false premise.
- (reach a conclusion by applying rules of logic): induce