How to Say "as one" in Spanish
The Spanish word for “as one” is “unánime” — B2 level.

Examples
La decisión del comité fue unánime.
The committee's decision was unanimous.
Hubo un grito unánime de protesta entre la multitud.
There was a unanimous shout of protest among the crowd.
Los expertos son unánimes al decir que la economía mejorará.
Experts are unanimous in saying that the economy will improve.
One ending for everyone
This word ends in -e, which means it doesn't change for masculine or feminine things. You say 'un voto unánime' (masculine) and 'una decisión unánime' (feminine).
Making it plural
To talk about more than one thing, simply add an -s: 'unánimes'. For example: 'Los resultados fueron unánimes'.
Don't change the ending to 'o' or 'a'
Mistake: “La respuesta fue unánima.”
Correction: La respuesta fue unánime. Words ending in -e are gender-neutral and don't change to 'a' even if the thing you're describing is feminine.
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