Find a concept

Type a word above, pick a category on the left, or expand the hierarchy to browse.

Every concept hangs off reality — the dictionary is one connected tree, and words are designations of concepts.

Why concept-first?

A word like process can designate several different concepts. A concept-first dictionary keeps those meanings apart. Each concept has a permanent identifier, a single definition, typed relations, and a CC0 source.

Every assertion in this database is public domain (CC0) or project-authored under CC0. Nothing here is copied from copyrighted dictionaries.