Prerection
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noun: The condition, state, or sensation of sexual excitement accompanied by increased pulse, [coursing] hormones (such as epinephrine) in the bloodstream, and neurotransmitters (such as [phenylalanine]) in the brain, that precedes an [male erection] of the penis, or female erection of the clitoris.
Prerection meaning & definition 1 of Prerection.