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  1. Base (Construction):
  • The lowest supporting part of an upright member, such as a column or pillar.
  1. Base (Painting):
  • The bottom layer or coating in a series of paint coats, which provides the foundation for subsequent layers.
  1. Base (Adhesive/Coating):
  • The major ingredient, excluding pigments and fillers, that constitutes the non-volatile portion of an adhesive, coating, or sealing compound. It provides the adhesive or cohesive properties.
  1. Base (Electronics – Transistor):
  • The region between the emitter and collector of a transistor, where minority carriers (electrons or holes) are injected or controlled. It acts as the control electrode in the transistor structure.
  1. Base (Electronics – Electron Tube):
  • The part of an electron tube that includes pins, leads, or terminals through which connections are made to internal electrodes or circuits.
  1. Base (Photography/Magnetic Media):
  • A thin, flexible support material on which a photographic emulsion or magnetic coating is applied. It provides physical support and stability to the sensitive coating.
  1. Base (Civil Engineering – Road Surface):
  • A layer of specified material and thickness placed below the road surface to provide structural support, stability, and drainage.

Each definition of “base” pertains to different fields, reflecting its varied applications and meanings depending on context.


  • Bead base
  • Carburetor Base
  • Edison base
  • Flat base rim taper
  • Flat base rim
  • Lithium base grease
  • Load base
  • Negative load base
  • Quaternary Ammonium Bases
  • Rim well base
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