Etymology
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billing (n.1)

1875, "announcement on a bill or poster," verbal noun from bill (v.) "post as a public notice" (see bill (n.1)); hence top billing (1928). Meaning "act of sending out a bill" is recorded from 1908.

billing (n.2)

"a dove-like caressing, love-making," 1580s; see bill (v.2).

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Definitions of billing

billing (n.)
request for payment of a debt;
Synonyms: charge
From wordnet.princeton.edu