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monomial a single term that does not require any addition or subtraction (ex:, 5, 3x, 3w/5, 3xyz binomial the sum/difference of 2 monomials (ex: 11a + 12b or 11x - 12y) trinomial the sum/difference of 3 monomials (ex: x2 + 2x - 5 or 2xy - 6y + 4) constant a term that does not contain a variable (ex: 2xy + 7y + 3 ....3 is the constant) polynomial the sum/difference of more than 3 monomials coefficient number in front of a variable (ex: 5x or 3y ...the 5 & the 3 are coefficients) like terms terms/monomials with the exact same variables with the exact same exponents (ex: 3xy and 5xy or 2b and 7b) unlike terms terms in an expression that have different variables or exponents (ex: 2b and 3xy or 7b and 5xy)