' Introversion '...

There are varying and deepening degrees of introversion, ranging from slight inattention to full absorption or trance, which is therefore only one degree or kind of introversion.

-- Notebooks Category 4: Elementary Meditation > Chapter 1: Preparatory > # 202

Trance is often a confusing word to use to describe the deepest condition of meditation. It could lead to misunderstanding. Safer words would be "dynamic reverie" or "constructive introversion." The idea of reverie promotes some kind of background awareness continuing through, either from one's surroundings or from oneself, and is therefore truer.

-- Notebooks Category 4: Elementary Meditation > Chapter 1: Preparatory > # 448

Paul Brunton