Septillionth Definition
 sĕp-tĭlyənth 
    noun
  
 The ordinal number matching the number septillion in a series.
 American Heritage 
One of a septillion equal parts.
 American Heritage 
The person or thing in the septillionth position.
 Wiktionary 
    adjective
  
 The ordinal form of the number septillion.
Wiktionary 
Other Word Forms of Septillionth
Noun
Singular:
 septillionthPlural:
 septillionthsOrigin of Septillionth
-  
septillion + -th
From Wiktionary
 
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