Decillion n. : According to the English notation, a million involved to the tenth power, or a unit with sixty ciphers annexed; according to the French and American notation, a thousand involved to the eleventh power, or a unit with thirty-three ciphers annexed. [See the Note under Numeration.]

Example:
How are Septtillion, Octillion, Nonillion and Decillion related to the the last 4 months of the year?

Taxonomy
large numbers, names of large numbers, googolplex, prefix, quadrillion, short scale, long scale, sextillion, quintillion, quattuordecillion, sexdecillion, octodecillion, vigintillion, Traditional British, standard dictionary, myriad, centillion, dictionaries.

Defination from the web:
Decillion. Thousand quintillion. Quintilliard. 11. 1036. Undecillion. Sextillion. Sextillion. 12. 1039. Duodecillion. Thousand sextillion. Sextilliard. 13. 1042 ... Thousand decillion. Decilliard. 21. 1066. Unvigintillion. Undecillion. Undecillion. 22. 1069. Duovigintillion. Thousand ...