Etymology
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wow (interj.)
1510s, Scottish, a natural expression of amazement. "This old interjection had a new popularity in the early 1900s and again during the 1960s and later" [DAS].
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wow (v.)
"overwhelm with delight or amazement," 1924, American English slang, from wow (interj.). Related: Wowed; wowing. Used as a noun meaning "unqualified success" since 1920.
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whoa (interj.)

1620s, a cry to call attention from a distance, a variant of who. As a command to stop a horse, it is attested from 1843, a variant of ho. As an expression of delight or surprise (1980s) it has gradually superseded wow, which was very popular in the 1960s.

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bow-wow 
imitative of a dog's barking, first recorded 1570s. Compare Latin baubor, Greek bauzein "to bark," Lithuanian baubti "cry," of cows, etc.
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bay (n.3)
"deep-toned howl of a dog," early 14c., earlier "howling chorus raised (by hounds) when in contact with the hunted animal," c. 1300, from Old French bayer, from PIE root *bai- echoic of howling (compare Greek bauzein, Latin baubari "to bark," English bow-wow; also see bawl).

From the condition of a hunted animal comes the transferred sense of "final encounter," and thence, on the notion of turning to face the danger when further flight or escape is impossible, at bay.
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powwow (n.)

also pow-wow, 1620s, "priest, conjurer, sorcerer among the North American natives," from a southern New England Algonquian language (probably Narragansett) powwaw "shaman, medicine man, Indian priest," from a verb meaning "to use divination, to dream," from Proto-Algonquian *pawe:wa "he dreams, one who dreams."

The meaning "magical ceremony among North American Indians" is recorded from 1660s. The general sense of "council, conference, meeting," especially if convivial, is recorded by 1812. Verb sense of "to confer, discuss, hold a consultation, deliberate over events" is attested from 1780.

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