matter of fact

Concise Oxford English Dictionary © 2008 Oxford University Press:
matter of fact

▶noun

• 1 a fact as distinct from an opinion or conjecture.

• 2 Law the part of a judicial inquiry concerned with the truth of alleged facts. Often contrasted with matter of law.

▶adjective (matter-of-fact)

• 1 concerned only with factual content.

• 2 unemotional and practical.

– phrases
as a matter of fact in reality; in fact.

– derivatives
matter-of-factly adverb,
matter-of-factness noun.