How to abbreviate Atrocious?

The ways to abbreviate Atrocious.

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ATROC:
Atrocious
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APASmart Define. (2018). atrocious. Retrieved April 20, 2018, from http://smartdefine.org/atrocious/abbreviations/a
ChicagoSmart Define. 2018. "atrocious" http://smartdefine.org/atrocious/abbreviations/a (accessed April 20, 2018).
HarvardSmart Define 2018, atrocious, Smart Define, viewed 20 April, 2018, <http://smartdefine.org/atrocious/abbreviations/a>.
MLASmart Define. "atrocious" 19 February 2018. Web. 20 April 2018. <http://smartdefine.org/atrocious/abbreviations/a>