scientific explanation
an account of an event, behavior, or thought that is couched in terms of an established set of scientific principles, facts, and assumptions. Typical forms of explanation may be reductionistic, analyzing a phenomenon into components and describing how they combine to produce the phenomenon; ontogenic, relating the phenomenon to a universal set of developmental stages; empiricistic, describing a phenomenon in terms of the conditions that have been observed to produce it; or metaphoric or categorical, identifying a phenomenon as similar in some important respects to other phenomena already understood. Such an explanation stated systematically is generally known as a theory.