| augend | (noun) a number to which another number (the addend) is added | - |
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| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| gauge | (noun) a measuring instrument for measuring and indicating a quantity such as the thickness of wire or the amount of rain etc. | Synonyms: gage |
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| (noun) the distance between the rails of a railway or between the wheels of a train | - |
| (noun) the thickness of wire | - |
| (noun) diameter of a tube or gun barrel | Synonyms: bore, caliber, calibre |
| (noun) accepted or approved instance or example of a quantity or quality against which others are judged or measured or compared | Synonyms: standard of measurement |