-tious
compound suffix, repr. L. -t-iōsus, consisting of -iōsus, -ious, appended to the -t of a L. participial stem. It thus serves to form adjectives belonging to ns. in -tion, as in ostentation, -tious, ambition, -tious, caution, -tious, contention, -tious, nutrition, -tious, superstition, -tious; but its range is much narrower than that of -tion.