γαλήνηgalḗnē, gal-ay'-nay; of uncertain derivation; tranquillity:—calm.
Thayer's Greek Lexicon
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STRONGS G1055:
γαλήνη, -ης, ἡ, (adjective ὁ, ἡ, γαληνός calm, cheerful), calmness, stillness of the sea, a calm: Matthew 8:26; Mark 4:39; Luke 8:24. (From Homer down.)