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"bases" is also used as a crossword clue. If that's what you saw, the answer is often foundations (11 letters).
Definitions
Foundations, starting points, or stations of operation.
Word origin
Borrowed from Latin basēs pl. See basis.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Foundations or stations”5 letters
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