Una
From BiblePortal Wikipedia
Webster's Dictionary [1]
(n.) In Sanskrit grammar, a lengthening of the simple vowels a, i, e, by prefixing an a element. The term is sometimes used to denote the same vowel change in other languages.
The Nuttall Encyclopedia [2]
E . who is one), the personification of Truth, the companion of St. George in his adventures, and who, after various adventures herself, is at last wedded to him.
