I the Trinity illústrate
Drinking water'd orange pulp,
In three sips the Arian frustrate.
While he drains his at one gulp,
it is now usual to say 'íllustrate'.
Adjectives of this class take as early a stress as they can, as 'órnate', 'pínnate', 'délicate', 'fórtunate'. Nouns from all these words throw the accent back and shorten or obscure all but the penultimate vowel, as 'ignorance', 'evaporation'.
Stems in -ia. Here even disyllables shorten the penultima, as 'copy', 'province', while longer words throw the stress back as well as shorten the penultima, as 'injury', 'colony', while 'ignominy' almost lost its penultimate vowel, and therefore threw back the stress to the first syllable. Shakespeare frankly writes the word as a trisyllable,
Thy ignomy sleep with thee in the grave.
Milton restored the lost syllable, often eliding the final vowel, as in
Exile, or ignominy, or bonds, or pain.