English
instigatory
From instigate + -ory.
Formed from instigate + -ory
Proto-Indo-European *(s)teyg- ‘to be sharp’
Latin īnstīgō ‘to instigate’
Latin īnstīgātus ‘stimulated, set on, incited, roused or urged’
English instigate
Today it means
adj Tending to instigate or provoke.
Language periods are conventional ranges, not dates for this word.
Etymograph / instigatory