The document defines key terms related to algebra, including: - An algebraic term can contain decimals, fractions, and unknown terms like x, y, z. - The numerical coefficient of an algebraic term cannot be 0 but can be any other real number. For terms like x, y, a, z, the numerical coefficient is considered to be 1. - Unknown terms are actually numbers, not just letters. The order of letters in a term does not matter, such as xy being equal to yx. - Terms are considered "like terms" if they have the same literal coefficient, such as 3lmn, 3mnl, and 9/2nmL. - Al