diff --git a/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md b/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md
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 # Unit 3: Quadratic Functions
 
 ## Definitions
+ - `Linear relation`: A relation with a constant rate of change
+ - `Non-linear relation`: A relation with a variable rate of change
+ - `Degree` of a polynomial: Highest exponent that appears in any term of a polynomial
+ - `a-value`: Step property
+ - `Axis of symmetry`: Vertical symmetrical line through a parabola, also x-value for vertex
+ - `Zeroes`: x-intercepts of parabola
+ - `Vertex`: Maximum or minimum value on a parabola
+ - `Optimal value`: y-value for vertex
+ - `Domain`: List of all valid x-values for relation, expressed as $`D = {num, num2, num3}`$ or as a relation such as $`D = {x E R, x != 0, x < 50`$
+ - `Range`: List of all valid y-values for relation, expressed as $`R = {num, num2, num3}`$ or as a relation such as $`D = {y E R, y != 0, y < 50`$
 
 ## Parabolas