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ir·ro·ta·tion·al | \ ˌir-(r)ō-ˈtā-shnəl 
, -shə-nᵊl \
, -shə-nᵊl \Definition of irrotational
1 : not rotating or involving rotation
2 : free of vortices
irrotational flow
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Time Traveler for irrotational
The first known use of irrotational was in 1875
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