vagary

[ vuh-gair-ee, vey-guh-ree ]
/ vəˈgɛər i, ˈveɪ gə ri /

noun, plural va·gar·ies.

an unpredictable or erratic action, occurrence, course, or instance: the vagaries of weather; the vagaries of the economic scene.
a whimsical, wild, or unusual idea, desire, or action.

Origin of vagary

1565–75, in sense “wandering journey”; apparently < Latin vagārī to wander
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British Dictionary definitions for vagary

vagary

/ (ˈveɪɡərɪ, vəˈɡɛərɪ) /

noun plural -garies

an erratic or outlandish notion or action; whim

Word Origin for vagary

C16: probably from Latin vagārī to roam; compare Latin vagus vague
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012