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

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preposition. In contrast or opposition to; against.

ad. In opposition to something stated or expected; to the contrary.

preposition. against; contrary or opposed to

ad. to the contrary to something

n. a deal to swap goods or services

n. an entry that cancels another entry

n. any of the musical instruments in the contrabass range, e.g. contrabassoon, contrabass clarinet or, especially, double bass

n. contra dance

A Latin adverb and preposition, signifying against, contrary, in opposition, etc., entering as a prefix into the composition of many English words. Cf. counter, adv. & pref.

A Latin adverb and preposition (and prefix), meaning ‘against,’ ‘over against,’ ‘opposite,’ ‘in front of,’ orig. ‘in comparison with’: used in the phrase per contra, and, abbreviated, in pro and con; also in various legal phrases, as contra bonos mores; usually as a prefix in words taken from the Latin or Romance languages, or formed analogously in English. In introducing a legal citation it means ‘to the contrary.’ See contra-.

A prefix of Latin origin, meaning ‘against,’ ‘over against,’ ‘opposite’; doublet of counter-. See contra and counter-.

n. The contrary or opposite side or thing: in bookkeeping, the opposite side or column of an account; especially the right-hand or credit side (in which appear the items against the person whose books are kept).

n. In organ-building, in the names of stops, indicating a stop whose tones are an octave below the pitch of the keys used: as, contragamba, etc.

n. a member of the guerrilla force that opposed a left-wing government in Nicaragua

"The gondoliers, chanting for a fare as they stood at the foot of the bridge in contra posto poses."

Nicaraguan   

counter   

entre   

hominem    hunc    suum    omnem    quidem    autem    eorum    mihi    omnium    Ea