adjective, bas⋅er, bas⋅est, noun | 1. | morally low; without estimable personal qualities; dishonorable; meanspirited; selfish; cowardly. |
| 2. | of little or no value; worthless: hastily composed of base materials. |
| 3. | debased or counterfeit: an attempt to eliminate the base coinage. |
| 4. | characteristic of or befitting an inferior person or thing. |
| 5. | of illegitimate birth. |
| 6. | not classical or refined: base language. |
| 7. | Old English Law. held by tenure less than freehold in return for a service viewed as somewhat demeaning to the tenant. |
| 8. | Archaic.
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| 9. | Obsolete. deep or grave in sound; bass: the base tones of a piano. |
| 10. | Music Obsolete. bass 1 (defs. 3, 4). |

base 2 (bās) adj. bas·er, bas·est
A bass singer or voice. [Middle English bas, low, from Old French, from Medieval Latin bassus.] base'ly adv., base'ness n. |
Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.
base
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base (bās)
n.
The part of an organ nearest its point of attachment.
A fundamental ingredient; a chief constituent of a mixture.
Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
A molecular or ionic substance capable of combining with a proton to form a new substance. Also called Brønsted base.
A nitrogen-containing organic compound that combines in such a manner.
A substance that provides a pair of electrons for a covalent bond with an acid.