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1Constituting number one trillion in a sequence.‘the trillionth digit’
- 1.1informal Constituting an unspecified but very large number in a sequence.‘we watch the ceremony for the trillionth time’
- 1.1informal Constituting an unspecified but very large number in a sequence.
2Each of one trillion equal parts into which something is or may be divided.‘a picogram is a trillionth of a gram’‘timescales of a few trillionths of a second’
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