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decline to refuse in a civil or polite way (to do or to give something). [10 definitions]
declivity a downward or descending slope. (Cf. acclivity.)
decoct to extract a flavor or essence from, by boiling.
decode to convert (a coded message) into ordinary language; decipher. [2 definitions]
décolletage a low neckline, esp. at the front of a woman's garment. [2 definitions]
décolleté of a garment, having a low neckline, esp. at the front. [2 definitions]
decolonization the process or act of freeing a colony or eliminating colonialism.
decolonize to set free (a colony or colonies) from colonial rule.
decompose to break down (a substance) into simpler compounds or component elements. [3 definitions]
decompose a number in mathematics education, to separate a number into its component place values. For example, to decompose the number 231 you would write "200+30+1".
decompress to reduce pressure or compression on. [3 definitions]
decompression the act or process of decompressing or being decompressed, as in deep-sea diving. [2 definitions]
decompression sickness a painful and sometimes fatal condition caused by the formation of nitrogen bubbles in the blood, resulting from returning to atmospheric pressure too quickly from deep water or a compression chamber; aeroembolism; bends.
decongestant a medical agent that reduces congestion, as in sinuses or nasal passages.
deconstruction a literary criticism philosophy, introduced in the 1960s, asserting that because words are defined using other words, the meaning of text has no stable reference and therefore cannot have a fixed meaning. [2 definitions]
decontaminate to clear of impurities or dangerous substances; remove contaminants from. [2 definitions]
decontrol to eliminate control over (something), esp. government control; deregulate. [2 definitions]
décor the style, furnishings, or decorative scheme of a room, building, or the like. [2 definitions]
decorate to make more attractive or interesting by adding ornamental items or designs. [5 definitions]
decoration an act, process, or technique of decorating. [3 definitions]
decorative adding to visual attractiveness; ornamental.