Archaic term for income, revenue, or profit derived from work, business, or investment.
A compound of 'gain' (profit) and 'come' (to arrive), literally meaning 'that which comes as profit.' This is an older English way of expressing what we now simply call 'income' or 'revenue.'
The shift from 'gaincome' to 'income' shows how English gets lazier and shorter over time—people basically optimized their vocabulary for speed, dropping the colorful 'gain' part and just saying 'in-come' instead.
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