Expressed disagreement, disapproval, or a reason against something that is happening or being proposed.
From Latin 'obicere,' meaning 'to throw against' or 'to oppose,' combining 'ob-' (against) and 'jacere' (to throw). The meaning shifted from physical opposition to verbal disagreement by the Middle English period.
In courtrooms, 'objection!' is one of the most recognizable phrases because lawyers are trained to immediately block statements that are inadmissible—they must object in the moment or they lose their right to appeal it later. The word literally traces back to throwing things against something, which perfectly captures the physical aggression underlying intellectual opposition.
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