What is the difference between introspection and reflection?

Question

Can anyone explain from a language/environment agnostic perspective the difference between these two notions?

Also is there a set of conditions that programming language

Answer 1

Reflection is a mechanism composed of two techniques :

1. Introspection

   The ability for a program to examine itself

2. Intercession

   The ability for a program to modify itself (his behaviour or his state)

Ref. https://fr.wikipedia.org/wiki/R%C3%A9flexion_(informatique)#Introspection_et_intercession

My reference is a french page because the english page doesn't refers directly to the term intercession.