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Noun: lengthening  leng-thu-ning
  1. The act of prolonging something
    "there was an indefinite lengthening of the peace talks";
    - prolongation, protraction, perpetuation
Verb: lengthen  lengk-thun
  1. Make longer
    "Lengthen this skirt, please"
     
  2. Become long or longer
    "In Spring, the days lengthen"

Type of: continuance, continuation, grow, increase

Antonym: shorten