Emily Dickinson Lexicon

PHE-NOM'E-NON, n. [plur. Phenomena. Gr. φαινομενον, from φαινομαι, to appear.]

In a general sense, an appearance; any thing visible; whatever is presented to the eye by observation or experiment, or whatever is discovered to exist; as, the phenomena of the natural world; the phenomena of heavenly bodies, or of terrestrial substances; the phenomena of heat or of color. It sometimes denotes a remarkable or unusual appearance.