The Collaborative International Dictionary
Extensional \Ex*ten"sion*al\, a. Having great extent.
Wiktionary
a. Of or pertaining to extension.
WordNet
adj. used of the class of entities to which a given word correctly applies
Usage examples of "extensional".
It goes something like this: The extensional area we call space-time is probably an illusion of the senses.
To find the primary extensional funding formula, multiply the departmental needs analysis by the fiscal base quotient, unless the project involves calibrated structuring, in which case the quotient should be calculated according to Section W-A of the accompanying instructions.
How many pilots, I wondered, had been lost to the manifold because they too often indulged in the power and joy of their extensional brains?
Had they shared the same extensional brain, solved the same theorems, viewed the manifold through the same inner eyes, thought the same thoughts?
Since I have to define it in terms of words, I can't be as clear as I might be if I were able to make an extensional definition.
I can offer nothing but intensional definitions in terms of other words, or extensional definitions expressed in incomplete statistics.