What does the word abstraction mean?

Usage examples for abstraction

  1. He downed half the goblet- full, set it down, and went to a painting, a brutal scarlet and apple- green abstraction, that hung on the wall. – Time Crime by H. Beam Piper
  2. But Hannah's face was very pale, and she was most unusually quiet all that day, falling into fits of abstraction as if her thoughts were far away. – Bessie Bradford's Prize by Joanna H. Mathews