1 (in neurophysiology) The one-way transfer of a nerve impulse from one neuron to another across a synapse. See also neurotransmitter. Compare propagation.
2 (in medicine) The spread of an infection from person to person. This can occur in various ways, such as close contact with an infected person, including sexual contact (see sexually transmitted disease); contact with a vector or a carrier of the disease; consuming food or drink contaminated with the infecting microorganism; and breathing in contaminated droplets of moisture, produced by coughing and sneezing.
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