[{"term": "Variable", "definition": "A letter or symbol that represents an unknown value."}, {"term": "Expression", "definition": "A mathematical phrase containing numbers, variables, and operations (no equals sign)."}, {"term": "Equation", "definition": "A mathematical statement that two expressions are equal (has an equals sign)."}, {"term": "Coefficient", "definition": "The number multiplied by a variable (in 3x, the coefficient is 3)."}, {"term": "Constant", "definition": "A fixed number with no variable attached."}, {"term": "Inverse Operation", "definition": "An operation that undoes another (addition undoes subtraction, multiplication undoes division)."}]