"preposition" in the noun sense
1. preposition
a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word
2. preposition
linguistics) the placing of one linguistic element before another (as placing a modifier before the word it modifies in a sentence or placing an affix before the base to which it is attached)
Source: WordNet® (An amazing lexical database of English)
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