The ordinal number position corresponding to centillion, or one part divided into centillion equal parts.
From 'centillion' + '-th' (ordinal suffix from Old English). Follows the standard English pattern for creating ordinal numbers from cardinal numbers.
The centillionth of a second is so impossibly small that it has no meaning in physics—our most precise measurements (using quantum mechanics) only go down to about 10^-35 seconds, making centillionths purely a mathematical fantasy!
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