1. any state or process known through the senses rather than by intuition or reasoning
2. a remarkable development
The Collaborative International Dictionary of English v.0.48:
Phenomenon \Phe*nom"e*non\, n.; pl. Phenomena. [L.
phaenomenon, Gr. faino`menon, fr. fai`nesqai to appear,
fai`nein to show. See Phantom.]
1. An appearance; anything visible; whatever, in matter or
spirit, is apparent to, or is apprehended by, observation;
as, the phenomena of heat, light, or electricity;
phenomena of imagination or memory.
In the phenomena of the material world, and in many
of the phenomena of mind. --Stewart.
2. That which strikes one as strange, unusual, or
unaccountable; an extraordinary or very remarkable person,
thing, or occurrence; as, a musical phenomenon.
WordNet (r) 3.0 (2006):
n 1: any state or process known through the senses rather than
by intuition or reasoning
2: a remarkable development
Moby Thesaurus II by Grady Ward, 1.0:
58 Moby Thesaurus words for "phenomenon":
abnormality, actuality, adventure, amazement, anomaly, apparition,
appearance, astonishing thing, astonishment, circumstance,
curiosity, episode, event, exception, experience, fact,
false image, figure, form, gazingstock, hap, happening,
happenstance, image, incident, marvel, marvelment, matter of fact,
miracle, mirage, nonesuch, occasion, occurrence, paradox,
particular, peculiarity, phantom, phasm, portent, presence,
prodigy, quite a thing, rarity, reality, sensation, shape, sight,
singularity, something else, spectacle, stunner, turn of events,
uniqueness, unusualness, vision, wonder, wonderful thing,