In statistics, 'linear' refers to relationships or functions that can be graphically represented as a straight line. Linear equations and models are used to describe the relationship between two variables.
Correlation Coefficient: A measure that determines the strength and direction of the linear relationship between two variables.
Scatter Plot: A graphical representation that uses dots to represent values obtained for two different variables, often used to identify correlations.
Slope: The rate at which one variable changes with respect to another in a linear equation; represented by $m$ in $y = mx + b$.