| BAS | the stock of basic facilities and capital equipment needed for the functioning of a country or area |
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| BAS | the fundamental assumptions underlying an explanation |
| BAS | (linguistics) the form of a word after all affixes are removed |
| BAS | a lower limit |
| BAS | the place where you are stationed and from which missions start and end |
| BAS | (anatomy) the part of an organ nearest its point of attachment |
| BAS | the bottom or lowest part |
| BAS | (in a digital numeration system) the positive integer that is equivalent to one in the next higher counting place |
| BAS | the bottom side of a geometric figure from which the altitude can be constructed |
| BAS | any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water |
| BAS | use as a basis for |
| BAS | assign to a station |