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

• a boxing match between professional boxers for a cash prize

• box for a prize or money

• a professional boxer

• attempting to justify or defend in speech or writing

• providing justification

• a verb form that serves to express frequent repetition of an action

• in an affirmative manner

• (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)