13-Letter Words Containing: O,R,T,I,F

• attempting to justify or defend in speech or writing

• providing justification

• (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression

• the act of making formal (as by stating formal rules governing classes of expressions)

• To separate into parts or fractions; to fractionate

• creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant

• making fertile as by applying fertilizer or manure