This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Used to refer to something discussed later.

ad. Below; beneath; under; after; -- often used as a prefix.

A Latin preposition meaning ‘below, beneath,’ occurring in some phrases occasionally used in English.

A prefix of Latin origin, meaning ‘below, beneath.’

ad. (in writing) see below

"Those who possessed a smaller income were described by the term infra classem, below the pre-eminent class."

supra   

below    beneath    under    after   

modu    supra    coquit    proceso    al    docuerat    etiam    minori    post    judicia