I’ve occasionally run across the term “intension” but never understood it; I still don’t (OED: “5. Logic. The internal quantity or content of a notion or concept, the sum of the attributes contained in it; the number of qualities connoted by a term”), but I found the discussion of its history linked by Sarah Lobar in this OUPblog post interesting enough to pass on:
“Why the “S” in “intension”?” by Mary Spencer
The peculiar spelling of the logical term “intension” has always given pause to laymen readers of English logical prose. From time to time, in fact, even the initiate tend to become confused. […] It turns out that (1) Sir William Hamilton did not introduce the word “intension ” into the logical vocabulary, and (2) neither he nor the man who did introduce it were in any sort of muddle about its meaning.
Click the link for the exciting facts!
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