The word octillion has different meanings depending on what you are interested in. For instance it can refer to the cardinal number equivalent to 10 to the power of 27. In Britain, the word refers to the cardinal number equivalent to 10 to the power of 48.
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what is the definition of octillion
NOUN [PLURAL OC·TIL·LIONS, (AS AFTER A NUMERAL) OC·TIL·LION.]
a cardinal number represented in the U.S. by 1 followed by 27 zeros, and in Great Britain by 1 followed by 48 zeros.