Abstract
Hegel (methodological qualification)
For Hegel, abstract means: one-sided, isolated, poor in determinations. The abstract has abstracted from mediation, treats a moment as self-standing. Examples: pure being (the most abstract category), formal identity (A=A), isolated consideration of the particular. "Abstract" is a critique: something is comprehended too one-sidedly. The understanding works abstractly (separates, fixes). Reason wants to become concrete (mediated, living). The movement of the Logic: from abstract to concrete.
Origin
Lat. *abstrahere* (to draw away, take away). Traditionally: abstraction forms general concepts. Hegel inverts this: abstract = poor, one-sided (not: general). The general can be concrete (as a developed totality).
In Hegel
Enc. §80 (understanding); SL Vol. 1, Preface