English
instanton
From instant + -on.
A compound of instant + -on
Proto-Indo-European *steh₂- ‘to stand’
…
Latin īnstō ‘to stand upon, be nearby’
Latin īnstāns ‘present, pressing, urgent’
Old French instant ‘assiduous, at hand’
Middle English instant ‘infinitely short period of time’
English instant
Today it means
noun A solution to the imaginary time nonlinear field equation of Yang-Mills theory; carries information about quantum tunnelling.
Language periods are conventional ranges, not dates for this word.
Etymograph / instanton