Etymology
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coastal (adj.)

"of or pertaining to a coast or shore," 1872, from coast (n.) + -al (1). The proper Latin form costal is used only of ribs.

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Definitions of coastal

coastal (adj.)
of or relating to a coast;
coastal erosion
coastal (adj.)
located on or near or bordering on a coast;
coastal waters
coastal marshes
the Atlantic coastal plain
From wordnet.princeton.edu