Usage Note
Unilateral is a formal, mostly political and legal adjective meaning a decision made by one party alone. It does not change for gender (una decisión unilateral, un acto unilateral). The phrase de forma unilateral (unilaterally) is common in news and diplomatic contexts.
Examples
"Tomaron una decisión unilateral sin consultar."
Natural Translation
They made a unilateral decision without consulting.

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