Origin: Latin suffix -al
Infinitesimal has 4 different meanings across 2 categories:
(mathematics) a variable that has zero as its limit
A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number).
infinitely or immeasurably small
"two minute whiplike threads of protoplasm"
"reduced to a microscopic scale"
Incalculably, exceedingly, or immeasurably minute; vanishingly small.