A preposition is a word that indicates the relationship between a noun or pronoun and other words in a sentence, with common examples like 'at', 'on', and 'in'. Prepositions serve various functions including showing direction, time, position, and spatial relationships, often through prepositional phrases. The document also outlines types of prepositions related to time, place, direction, location, and spatial relationships, along with examples for each type.
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