let be vs variate

let be

• Used to assign a value to a symbol. 

• To not disturb or meddle with; to leave (someone or something) alone (see let it be). 

variate

• To alter; to vary; to make or become different. 

• The measured magnitude of a variable. 

• random variable 

• A variable, often the set of x values plotted on a graph. 

• A measurable quantity capable of taking on a number of values.