Noun

1. Installation from which a military force initiates operations
2. Lowest support of a structure
3. A place that the runner must touch before scoring
4. The bottom or lowest part
5. (anatomy) the part of an organ nearest its point of attachment
6. A lower limit
7. The fundamental assumptions from which something is begun or developed or calculated or explained
8. A support or foundation
9. A phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (dna or rna)
10. Any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water
11. The bottom side of a geometric figure from which the altitude can be constructed
12. The most important or necessary part of something
13. (numeration system) the positive integer that is equivalent to one in the next higher counting place
14. The place where you are stationed and from which missions start and end
15. A terrorist network intensely opposed to the united states that dispenses money and logistical support and training to a wide variety of radical islamic terrorist groups; has cells in more than 50 countries
16. (linguistics) the form of a word after all affixes are removed
17. The stock of basic facilities and capital equipment needed for the functioning of a country or area
18. The principal ingredient of a mixture
19. A flat bottom on which something is intended to sit
20. (electronics) the part of a transistor that separates the emitter from the collector

Verb

1. Use as a basis for; found on
2. Situate as a center of operations
3. Use (purified cocaine) by burning it and inhaling the fumes