15-Letter Words Containing: RIE

• The scientific study of psychology and motivation in history.

• brain surgery on human patients intended to relieve severe and otherwise intractable mental or behavioral problems

• of or relating to a 500th anniversary

• the 500th anniversary (or the celebration of it)

• an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits

• (physics) a theory that tries to link the four fundamental forces

• either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments)

• of words or propositions so related that each is the negation of the other

• acting as or providing a complement (something that completes the whole)