Variable/ˈveriəbl,ˈværiəbl/ Definition 1 of 3Pro Tip 1/3In Research Contexts Used to describe factors in experiments that can be manipulated or measured. To understand plant growth, sunlight was considered a variable. Pro Tip 2/3Predicting Outcomes In discussions on future events, signifies uncertain factors affecting outcomes. Weather variables make the game's result unpredictable. Pro Tip 3/3Mathematical Context Refers to symbols representing numbers in math equations, which can change. Let variable 'a' be any number greater than zero.