The word longitudinal is an adverb and according to Merriem-Webster it means, “involving the repeated observation or examination of a set of subjects over the time with respect to one or more study variables.” This word can be found in the text “How to raise a feminist son” by Claire Cain Miller. The article says, “ Yet longitudinal studies suggest that toy segregation has long-term effects on gender gaps in academics, spatial skills and social skills, according to Campbell Leaper, chairman of the psychology department at the University of California, Santa Cruz.” This illustrates that repeated studies have shown that separating what toys girls and boys should be playing with according to their gender has had long term effects. Knowing and understanding this word will help me get my points across on my masculinity essay.