Fromquintillion +‎-th(ordinal suffix).

• IPA^(key): /kwɪnˈtɪl.i.ənθ/

• Audio(US):

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quintillionth (notcomparable)

1. The ordinal form of the numberone quintillion.

quintillionth (pluralquintillionths)

1. The person or thing in the quintillionth position.
2. One of a quintillion equal parts of a whole.

• English terms suffixed with -th (ordinal)
• English 4-syllable words
• English terms with IPA pronunciation
• English terms with audio pronunciation
• English lemmas
• English adjectives
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• English nouns
• English countable nouns
• English ordinal numbers

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