puhekieltä The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being. (quote-journal) (Review)|location=London|date=12 April 2014|page=R10|passage=w:Martin Heidegger|&91;Martin&93; Heidegger's concern (..) was with ontology, the nature of beings, above all humans. The central question for him was "What is being? What is it for something to be?" He tackled this question not by way of the sciences, but by way of an examination of our prescientific daily life. We are, he argued, not cut off from the world by our mental processes: we are "in the world", in direct contact with our surroundings. puhekieltä The theory of a particular philosopher or school of thought concerning the fundamental types of entity in the universe.
2000, w:C. D. C. Reeve|C. D. C. Reeve, Substantial Knowledge: Aristotles Metaphysics'', Hackett Publishing, p. 97:
The answer to the controversial question of whether Aristotle's ontology includes non-substantial particulars, then, is that it does.
puhekieltä A logical system involving theory of classes, developed by w:Stanislaw_Lesniewski Stanislaw Lesniewski (1886-1939). puhekieltä A structure of concepts or entities within a domain, organized by relationships; a system model.