If a group decides something unanimously, it means that every single member is in agreement. A vote passed unanimously has no one objecting to it.

When Congress passes a bill unanimously, each member agrees that it should become a law. Things that are done or agreed on unanimously have no dissenters, no one arguing against them — it's as if the group were thinking as a single entity. In fact, the root of unanimously is the Latin unanimus, "of one mind," from unus, "one," and animus, "mind."

Definitions of unanimously
  1. adverb
    of one mind; without dissent
    “the Senate unanimously approved the bill”
    “we voted unanimously
    synonyms: nem con, nemine contradicente
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