Etymology
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payload (n.)

also pay-load, by 1914, from pay + load (n.). Originally the part of a truck's (later an aircraft's) load from which revenue is derived (passengers, cargo, mail); figurative sense of "bombs, etc. carried by a plane or missile" is from 1936.

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Definitions of payload

payload (n.)
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents;
Synonyms: warhead / load
payload (n.)
goods carried by a large vehicle;
From wordnet.princeton.edu