The last letter of emarginate is not optional
silent-eThe final e of emarginate is not pronounced. It belongs to the -ate ending.
heard asemarginat
spelledemarginate
saidee-MAR-jin-ut
emarginate, with the e.
You cannot hear it. It sits at the end doing its usual English job of keeping the vowel before it long, so the word finishes on -ate rather than -at.
Nearby in the file
emargenate emerginate emarrginate emarginute emarjinate emarginnate
The rest are on the word page. All 11 spellings of emarginate.