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1) A musical instrument that is not electric
2) A musical performance that uses no electric instruments (aside from microphones and similar amplification)
1) Jimi Hendrix played an electric guitar on the song "Purple Haze", but Paul Simon played an acoustic guitar on Simon & Garfunkel's "Mrs. Robinson". Techno and dance music uses electric drums, but rock music typically sticks to acoustic drums.

2) Eric Clapton's band did an acoustic show on "Mtv Unplugged".
by Bill M. August 27, 2004
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Oct 27 Word of the Day
The time between Christ’s birth and the beginning of the coronavirus.
In late 2016 AD or 3 B.C.V., Donald Trump was elected as the 45th President of the United States of America.
by JDS12 March 27, 2020
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2
A mispronunciation of "autistic", however it is not synonymous with autistic. It is normally used when someone says/does something ridiculously stupid or ignorant.
"¿Como se dice 'how do you say' en español?"
"Are you acoustic?"
by Medium Salsa December 11, 2016
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3
Someone who acts as if they are autistic, but is not medically diagnosed with autism. This word is not offensive, and is used as a polite and assertive way of calling someone autistic and stupid
Phil is being very acoustic!
by Alex from minecraft September 09, 2018
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4
A mispronunciation of 'autistic'. Typically used to scold someone, and by consequence, demonstrating the person's hypocrisy and severe mental disablements.
Driver: "You're acoustic! I wasn't even near the speed limit!"
Policeman: "Alright, send him to the mental asylum boys."
by Alexander Superslim October 09, 2017
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5
a musical instrument which produces its normal sound through the sounding board and is not amplified in any way
Mumford and Sons is an Acoustic Band, that uses all Acoustic instruments.
by ilovemumfordmorethenanything September 25, 2012
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