early 14c., "illusory appearance," from Old French fantaisie, phantasie "vision, imagination" (14c.), from Latin phantasia, from Greek phantasia "power of imagination; appearance, image, perception," from phantazesthai "picture to oneself," from phantos "visible," from phainesthai "appear," in late Greek "to imagine, have visions," related to phaos, phos "light," phainein "to show, to bring to light" (see phantasm). Sense of "whimsical notion, illusion" is pre-1400, followed by that of "fantastic imagination," which is first attested 1530s. Sense of "day-dream based on desires" is from 1926. In early use in English also fantasie, phantasy, etc. As the name of a fiction genre, from 1949.
中文解释
1、fant- + -asy.2、其实也就是看得见摸不着的东西，也就是很虚幻、很梦幻的东西。3、其词根的原始含义为：visible, appear. => only image or picture, picture to oneself, imagine.4、由此，该词的含义就很明确了：幻想，空想，狂想，白日梦；错觉，幻觉；怪念头，想入非非。
实用例句
1. The film starts off realistically and then develops into a ridiculous fantasy.
电影以写实开头，然后却发展成为荒诞的幻想。
来自柯林斯例句
2. She clings to a romantic fantasy of wedded bliss.
她沉醉于婚后幸福的浪漫幻想。
来自柯林斯例句
3. She invents fantasy lives for her own vicarious pleasure.
她幻想过着各种奇妙的生活，从想入非非中获得乐趣。
来自柯林斯例句
4. Falling in love the first time is all froth and fantasy.
初恋完全是一场虚幻的美梦。
来自柯林斯例句
5. Children use fantasy to explore worrying aspects of real life.