A form of steganography in which certain letters from a passage, usually the first in each line, form a name, motto, or message when read in sequence. Often disguised as a poem.
The following is an "acrostic poem":

Elegantly and efficiently shaped
Good to eat
Great fun to find at Easter
Smooth shelled
by Sven Viking December 31, 2005
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An urban legend. A myth. It doesn't exist. Some say it is a mysterious derivative of the word "across", but they would be mistaken. Or the "past tense" of across. However, that claim is ludicrous because across is a preposition. And prepositions don't have "past tenses." For those of you who don't pay attention is English class (all of us!) prepositions have "past participles." People that claim acrost is a word are just like the ones who claim to have seen UFO's or bigfoot. Although bigfoot has those Patterson films. Hmmm...convincing. But these people have no proof that this word exists. And besides they sound retarded when they say it.
a. I went "acrost" the dirt road to get some cigs at the tobacco store in my redneck town. Then I saw bigfoot!!
by poor grammar pisses me off. April 26, 2009
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Acrost = Across; usually takes the auxiliary preposition "from".
It is a dialectical form of the preposition which means "facing", as in: "The house sat ACROSS from the schoolyard", or "The house sat FACING the schoolyard".

Acrost is not correct. You will never, in your lifetime, find it in a dictionary, and you should never use it. I will repeat: YOU WILL NEVER FIND "ACROST" IN A DICTIONARY. People who use the preposition "acrost" as a replacement for "across" are usually ignoramuses and should be ignored.
We ran ACROST the parking lot.

Acrost, is, of course, completely incorrect. One should say:

We ran ACROSS the parking lot.
by Sebastian Elliott June 27, 2009
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"Across," but colloquial. Generally not acceptable in formal writing, but it is PERFECTLY FINE to use informally, as long as you use it to describe an action in the past. Stop enforcing your prescriptive grammar on us, y'all; I don't have to write like a haughty 19th century Latin student if I don't want to.
"I ran acrost the street yesterday to warn Randy that his sticks were burning."

And sometimes, but generally not,

"I will run acrost the street right now and yell, 'Randy, your sticks!'"
by PleaseStopBeingRude September 2, 2019
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An acrostic is a poem or other form of writing in which the first letter, syllable or word of each line, paragraph or other recurring feature in the text spells out a word or a message.
Acrostic poem of the name/word "Jim"
J-Joking
I-intriguing
M-millionaire
by Jimmy The Guy January 14, 2014
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