Stress in usually on the vowel before the last consonant.
amar (ah-MAHR)
mundial (moon-dee-AHL)
actualitate (ahk-too-ah-lee-TAH-teh)
lectura (lehk-TOO-rah)

If the final 2 letters are vowels, then the next to last vowel is accented.
io = EE-oh
flue = FLOO-eh
die = DEE-eh

The accent does not change when the -s of the plural is added.

If the word ends in any of the following, then stress is on
the second vowel prior to the last consonant.
­le, ­ne, ­re as in facile (FAH-see-leh), nomine (NOH-mee-neh), tempore (TEHM-po-reh)
­ic, ­ica, ­ico as in technic (TEHK-neek), technica (TEHK-nee-kah), technico (TEHK-nee-koh)
­ide, ­ido as in timide (TEE-mee-deh), acido (AH-see-doh)
­ula, ­ulo as in regula (REH-goo-lah) , angulo (AHN-goo-loh)
­ime, ­imo as in ultime (OOL-tee-meh)

Irregular accents are shown in the IED.
philologia (-ía) = {n} philology
gratis (grá-) [L] = {adv} gratis, free (of charge)