n. - A sole or supreme ruler; a sovereign; the highest ruler; an emperor, king, queen, prince, or chief.
n. - One superior to all others of the same kind; as, an oak is called the monarch of the forest.
n. - A patron deity or presiding genius.
n. - A very large red and black butterfly (Danais Plexippus); -- called also milkweed butterfly.
a. - Superior to others; preeminent; supreme; ruling.