1926, in the meaning defined atintransitive sense Time Traveler The first known use offantasizewas in 1926 See more words from the same year Cite this Entry Style “Fantasize.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fantasize. Accessed 9 May....
Medical Definition fantasize verb fan·ta·size variantsor Britishfantasise ˈfant-ə-ˌsīz fantasizedor Britishfantasised;fantasizingor Britishfantasising intransitive verb :to indulge infantasy:create or develop imaginative and oftenfantasticviews or ideas ...