phenomena

Etymology

The plural form of phenomenon, formed according to the Ancient Greek -ον (-on) → -α (-a) pluralisation pattern.

noun

1. plural of phenomenon
   She was a fat, round little woman, richly apparelled in velvet and lace, […]; and the way she laughed, cackling like a hen, the way she talked to the waiters and the maid, […]—all these unexpected phenomena impelled one to hysterical mirth, and made one class her with such immortally ludicrous types as Ally Sloper, the Widow Twankey, or Miss Moucher. 1918, W. B. Maxwell, chapter 2, in The Mirror and the Lamp