| addend | (noun) a number that is added to another number (the augend) | - |
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| addendum | (noun) textual matter that is added onto a publication; usually at the end | Synonyms: postscript, supplement |
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| hiddenite | (noun) a green transparent form of the mineral spodumene used as a gemstone | - |
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| hiddenness | (noun) the state of being covert and hidden | Synonyms: covertness |
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| midden | (noun) a heap of dung or refuse | Synonyms: dunghill, muckheap, muckhill |
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| (noun) (archeology) a mound of domestic refuse containing shells and animal bones marking the site of a prehistoric settlement | Synonyms: eitchen midden, kitchen midden |
| suddenness | (noun) the quality of happening with headlong haste or without warning | Synonyms: abruptness, precipitance, precipitancy, precipitateness, precipitousness |
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