For the term in genetics, see base In chemistry, a base is a substance that, in aqueous solution, is slippery to the touch, tastes bitter, changes the colour of indicators, reacts with acids to form salts, and promotes certain chemical reactions . Examples of bases are the hydroxides of the alkali and alkaline earth metals . Such substances produce hydroxide ions in aqueous solutions, and are thus classified as Arrhenius bases.

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  1. Something from which other things extend; a foundation.
    1. A supporting, lower or bottom component of a structure or object.
    2. The starting point of a logical deduction or thought; basis.
  2. A permanent structure for housing military personnel and material.
  3. The place where decisions for an organization are made; headquarters.
  4. A basic but essential component or ingredient.
  5. A substance used as a mordant in dyeing.
  6. Any of a class of generally water-soluble compounds, having bitter taste, that turn red litmus blue, and react with acids to form salts.
  7. Important areas in games and sports.
    1. A safe zone in the children's games of tag and hide-and-go-seek.
    2. One of the three places that a runner can stand without being subject to being tagged out.
  8. The lowermost part of a column, between the shaft and the pedestal or pavement.
  9. A nucleotide's nucleobase in the context of a DNA or RNA biopolymer.
  10. The end of a leaf, petal or similar organ where it is attached to its support.
  11. The name of the controlling terminal of a bipolar transistor (BJT).
  12. The lowest side of a in a triangle or other polygon, or the lowest face of a cone, pyramid or other polyhedron laid flat.
  13. A number raised to the power of an exponent.
    The logarithm to base 2 of 8 is 3.
  14. Alternative to radix.
  15. The set of sets from which a topology is generated.
  16. A topological space, looked at in relation to one of its covering spaces, fibrations, or bundles.
  17. A cheerleader who stays on the ground.
  18. A morpheme (or morphemes) that serves as a basic foundation on which affixes can be attached.
  19. The smallest kind of cannon.
  20. The lower part of the field. See .
  21. The housing of a horse.
  22. A kind of skirt (often of velvet or brocade, but sometimes of mailed armour) which hung from the middle to about the knees, or lower.
  23. The lower part of a robe or petticoat.
  24. An apron.
  25. A line in a survey which, being accurately determined in length and position, serves as the origin from which to compute the distances and positions of any points or objects connected with it by a system of triangles.

Noun (etymology 2)

  1. The game of prisoners' bars.


  1. To give as its foundation or starting point; to lay the foundation of.
  2. To be located (at a particular place).


  1. Low in height; short.
    base shrubs
  2. Low in place or position.
  3. Of low value or degree.
  4. Of low social standing or rank; vulgar, common.
  5. Morally reprehensible, immoral; cowardly.
  6. Inferior; unworthy, of poor quality.
  7. Designating those metals which are not classed as or .
  8. Alloyed with inferior metal; debased.
    base coin; base bullion
  9. Of illegitimate birth; bastard.
  10. Not classical or correct.
    base Latin
    the base tone of a violin
  11. Not held by honourable service.
    A base estate is one held by services not honourable, or held by villenage. Such a tenure is called base, or low, and the tenant is a base tenant.

The above text is a snippet from Wiktionary: base
and as such is available under the Creative Commons Attribution/Share-Alike License.

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