D defs.my
Entry 2 senses Webster, 1913

Problem

/präb'-ləm/ · Prob·lem · IPA /ˈpɹɑbləm/
01 n. A question proposed for solution; a matter stated for examination or proof; hence, a matter difficult of solution or settlement; a doubtful…
  1. 1.
    A question proposed for solution; a matter stated for examination or proof; hence, a matter difficult of solution or settlement; a doubtful case; a question involving doubt.
  2. 2.
    Anything which is required to be done; as, in geometry, to bisect a line, to draw a perpendicular; or, in algebra, to find an unknown quantity.(Math.)
Phrases & compounds
Plane problem — a problem that can be solved by the use of the rule and compass.
Solid problem — a problem requiring in its geometric solution the use of a conic section or higher curve.