Fictional

google

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late Middle English (in the sense ‘invented statement’): via Old French from Latin fictio(n- ), from fingere ‘form, contrive’. Compare with feign and figment.

wiktionary

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fiction +‎  -al

etymonline

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fictional (adj.)

"pertaining to fiction," 1833, from fiction + -al (1). Earlier fictitious also was used in this sense (1773).