mid-15c., a back-formation from tranquility or else from Latin tranquillus "quiet, calm, still." Related: Tranquilly.
a lake of tranquil blue water reflecting a tranquil blue sky
she became more tranquil
tranquil life in the country
trample
trampoline
trance
tranche
trannie
tranquil
tranquility
tranquilize
tranquilizer
trans-
trans.
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