Before revision: (1) It could be a reason, such as why the angles of a triangle sum to two right angles, or (2) a cause, such as why days are shorter in winter than summer, or (3) a design requirement as in a timepiece.Richard Whately (1845) Elements of Rhetoric, page 58, via Internet Archive ArchiveMary Prior and Arthur Prior "Erotetic Logic", The Philosophical Review 64(1) (1955): pp.
After revision: (1) It could be a reason, such as why the angles of a triangle sum to two right angles, or (2) a cause, such as why days are shorter in winter than summer, or (3) a design requirement as in a timepiece.Richard Whately (1845) Elements of Rhetoric, page 58, via Internet , ArchiveMary Prior and Arthur Prior "Erotetic Logic", The Philosophical Review 64(1) (1955): pp.