jan 4, 1611 - "Obesity" is defined in the dictionary

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Obesity (n.): "condition or quality of being corpulent," 1610s, from French obésité and directly from Latin obesitas "fatness, corpulence," from obesus "that has eaten itself fat," past participle of obedere "to eat all over, devour," from ob "about; because of" (see ob-) + edere "eat" (from PIE root *ed- "to eat"). (1)

Obese (adj.): "exceedingly fat," 1650s, back-formation from obesity and in part from Latin obesus "fat, stout, plump," literally "that has eaten itself fat," past participle of obedere "to eat all over, devour," from ob "about; because of" (see ob-) + edere "eat" (from PIE root *ed- "to eat"). According to OED, "Rare before 19th c." Related: Obeseness. Latin obesus was translated in Old English as oferfæt "overfat." As Latin obesus also could be read as "eaten up," it also was used in a passive sense, "wasted away, lean." (2)

Sources:
1.
2. Obesity. In: Harper D, ed. Online Etymology Dictionary. Etymonline Website. https://www.etymonline.com/word/obesity. Accessed December 19, 2020.
3. Obese. In: Harper D, ed. Online Etymology Dictionary. Etymonline Website. https://www.etymonline.com/word/obese#etymonline_v_30943. Accessed December 19, 2020.

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