I. ]t\ adjective
Etymology: Latin congruent-, congruens, present participle of congruere to come together, coincide, agree
1.
a. : in agreement : coinciding, corresponding
to keep imaginary characters congruent with actual models — Bernard De Voto
hypotheses congruent with our experiences
b. logic : relating to or predicable of the same subject : differing from each other but predicable as true of the same state of things
congruent propositions
2. geometry : superposable so as to be coincident throughout
3. : relating to the melting point at which there coexist for a molecular compound both liquid and solid phases having the same composition
• con·gru·ent·ly adverb
II. adjective
: related in such a way that the difference is divisible by a given modulus
12 is congruent to 2 (modulo 5) since 12 - 2 = 2·5