verb (used without object), the·o·rized, the·o·riz·ing.
- to form a theory or theories.
verb (used with object), the·o·rized, the·o·riz·ing.
- to form a theory or theories about.
verb
- (intr) to produce or use theories; speculate
v.1630s, perhaps a formation in English from theory + -ize. Related: Theorized; theorizing.