1. Pros.an unaccented syllable at the close of a line of poetry, often one that is added to the metrical pattern as an extra syllable.
2. Gram.a termination or final syllable marking a feminine word: In Latin -ā is a feminine ending for the ablative case in the singular.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.