noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The engineer carefully measured the distance ad filum aquae to ensure the pipeline was installed correctly.
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I placed the bookshelf ad filum aquae against the wall, it looks straight to me.
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I parked my car ad filum aquae in the parking spot, no need to adjust it.
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She walked ad filum aquae on the edge of the law, always pushing the boundaries.