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Noun: one-quintillionth
  1. One part in a quintillion equal parts
    - quintillionth

Derived forms: one-quintillionths

Type of: common fraction, simple fraction, vulgar fraction [Brit]

Nearest

oneness
one-night stand
one-ninth
one-off
one-on-one
one-party
one-person
one-piece
one-quadrillionth
one-quarter
one-quintillionth
onerous
onerously
onerousness
one-seed
one-seeded
oneself
one-seventh
one-sided
one-sidedly
one-sidedness