mid-14c., "edge of a sea or lake;" late 14c., "space between a block of text and the edge of a page," from Latin marginem (nominative margo) "edge, brink, border, margin," from PIE root *merg- "boundary, border." General sense of "boundary space; rim or edge of anything" is from late 14c. Meaning "comfort allowance, cushion" is from 1851; margin of safety first recorded 1888. Stock market sense of "sum deposited with a broker to cover risk of loss" is from 1848. Related: Margins.
c. 1600, "to furnish with marginal notes," from margin (n.). From 1715 as "to furnish with a margin."
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