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 List of 11-letter words containing Click to add a sixth letter
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 There are 11 eleven-letter words containing SECON| ATTOSECONDS | • attoseconds n. Plural of attosecond. • ATTOSECOND n. ten to the power of minus eighteen seconds. |  | FEMTOSECOND | • femtosecond n. A unit of time equal to 0.000 000 000 000 001 seconds (i.e. 1×10−15 seconds) and with symbol fs. • FEMTOSECOND n. one quadrillionth part of a second. |  | MICROSECOND | • microsecond n. (Metrology) An SI unit of time equal to 10-6 seconds. Symbol: μs It is commonly represented with symbol… • MICROSECOND n. one millionth of a second. |  | MILLISECOND | • millisecond n. One one-thousandth of a second. Symbol: ms. • MILLISECOND n. a thousandth part of a second. |  | NANOSECONDS | • nanoseconds n. Plural of nanosecond. • NANOSECOND n. a billionth of a second. |  | PICOSECONDS | • picoseconds n. Plural of picosecond. • PICOSECOND n. a trillionth of a second. |  | SECONDARIES | • secondaries n. Plural of secondary. • SECONDARY n. a subordinate. |  | SECONDARILY | • secondarily adv. With lesser importance. • secondarily adv. In a secondary manner or degree. • secondarily adv. (Obsolete) Secondly; in the second place. |  | SECONDMENTS | • secondments n. Plural of secondment. • SECONDMENT n. the act of seconding. |  | YOCTOSECOND | • yoctosecond n. (Metrology) An SI unit of time equal to 10-24 seconds. Symbol: ys. • YOCTOSECOND n. a very small unit of time. |  | ZEPTOSECOND | • zeptosecond n. (Metrology) A unit of time equal to 0.000 000 000 000 000 000 001 seconds, that is, 10-21 second, and… • ZEPTOSECOND n. a 10 to the -21 part of a second. |  
 Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America. Definitions are short excerpt from the WikWik.org and 1Word.ws. 
 See this list for:- English Wiktionary: 85 words
 - Scrabble in French: 14 words
 - Scrabble in Spanish: no word
 - Scrabble in Italian: 28 words
 - Scrabble in German: no word
 - Scrabble in Romanian: 9 words
 
 
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