Main Entry:: ¹dou·ble
Pronunciation:: \ˈdə-bəl\
Function:: adjective
Etymology:: Middle English, from Anglo-French duble, double, from Latin duplus (akin to Greek diploos), from duo two + -plus multiplied by; akin to Old English -feald -fold — more at two, -fold
Date:: 13th century

1: having a twofold relation or character : dual2: consisting of two usually combined members or parts <an egg with a double yolk>3 a: being twice as great or as many <double the number of expected applicants> bof a coin : worth two of the specified amount <a double eagle> <a double crown>4: marked by duplicity : deceitful5: folded in two6: of extra size, strength, or value <a double martini>7: having more than the normal number of floral leaves often at the expense of the sporophylls8of rhyme : involving correspondence of two syllables (as in exciting and inviting)9: designed for the use of two persons <a double room> <a double bed>

— dou·ble·ness noun

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