A pier is a long platform built out over water so people or boats can use it, often for walking, fishing, or docking.
From Old French 'piere' meaning 'breakwater, stone structure', related to 'pierre' meaning 'stone'. Originally it referred to solid supports and sea walls before being used for long walkways over water.
A pier is like a finger of land reaching out into the water, but built instead of grown. In some cities, old working piers have been turned into parks and playgrounds, so the same structure changes roles over time.
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