| base | (adjective) serving as or forming a base | Synonyms: basal |
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| (adjective) debased; not genuine | - |
| (adjective) having or showing an ignoble lack of honor or morality | Synonyms: mean, meanspirited |
| (adjective) illegitimate | Synonyms: baseborn |
| (adjective) (used of metals) consisting of or alloyed with inferior metal | - |
| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: baseborn, humble, lowly |
| (adjective) not adhering to ethical or moral principles | Synonyms: immoral |
| (noun) a support or foundation | Synonyms: pedestal, stand |
| (noun) lowest support of a structure | Synonyms: foot, foundation, fundament, groundwork, substructure, understructure |
| (noun) a place that the runner must touch before scoring | Synonyms: bag |
| (noun) (electronics) the part of a transistor that separates the emitter from the collector | - |
| (noun) installation from which a military force initiates operations | Synonyms: base of operations |
| (noun) a flat bottom on which something is intended to sit | - |
| (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: infrastructure |
| (noun) the principal ingredient of a mixture | - |
| (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: basis, cornerstone, foundation, fundament, groundwork |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: radical, root, root word, stem, theme |
| (noun) a lower limit | Synonyms: floor |
| (noun) (anatomy) the part of an organ nearest its point of attachment | - |
| (noun) the place where you are stationed and from which missions start and end | Synonyms: home |
| (noun) the bottom or lowest part | - |
| (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: radix |
| (noun) the most important or necessary part of something | Synonyms: basis |
| (noun) the bottom side of a geometric figure from which the altitude can be constructed | - |
| (noun) any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water | Synonyms: alkali |
| (noun) a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA) | Synonyms: nucleotide |
| (verb) use as a basis for; found on | Synonyms: establish, found, ground |
| (verb) use (purified cocaine) by burning it and inhaling the fumes | Synonyms: free-base |
| (verb) situate as a center of operations | - |
| baseball | (noun) a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs | Synonyms: ball, baseball game |
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| (noun) a ball used in playing baseball | - |
| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |
| based | (adjective) having a base of operations (often used as a combining form) | - |
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| (adjective) having a base | - |
| baseless | (adjective) without a basis in reason or fact | Synonyms: groundless, idle, unfounded, unwarranted, wild |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| basely | (adverb) in a despicable, ignoble manner | Synonyms: meanly, scurvily |
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| basement | (noun) the lowermost portion of a structure partly or wholly below ground level; often used for storage | Synonyms: cellar |
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| (noun) the ground floor facade or interior in Renaissance architecture | - |
| baseness | (noun) unworthiness by virtue of lacking higher values | Synonyms: contemptibility, despicability, despicableness, sordidness |
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| basenji | (noun) small smooth-haired breed of African origin having a tightly curled tail and the inability to bark | - |
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