English
supernatation
From super- + natation.
Proto-Indo-European *(s)neh₂- ‘to swim’
…
Proto-Italic *(s)nāō ‘to swim’
Latin nō ‘to swim’
Latin natō ‘to swim or float’
Latin natātiō ‘a swim, an instance of swimming’
English natation
Today it means
noun flotation
Language periods are conventional ranges, not dates for this word.
Etymograph / supernatation