Etymology
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pier (n.)

late Old English, pere, "support of a span of a bridge," from Medieval Latin pera, a word of unknown origin, perhaps from Old North French pire "a breakwater," from Vulgar Latin *petricus, from Latin petra "rock" (see petrous), but OED is against this. Meaning "solid structure in a harbor, used as a landing place for vessels; mole or jetty projecting out to protect vessels from the open sea" is attested from mid-15c.

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Definitions of pier

pier (n.)
a platform built out from the shore into the water and supported by piles; provides access to ships and boats;
Synonyms: wharf / wharfage / dock
pier (n.)
(architecture) a vertical supporting structure (as a portion of wall between two doors or windows);
pier (n.)
a support for two adjacent bridge spans;
From wordnet.princeton.edu