"lengthening" in the noun sense
1. prolongation, protraction, perpetuation, lengthening
the act of prolonging something
"there was an indefinite prolongation of the peace talks"
"lengthening" in the verb sense
1. lengthen
make longer
"Lengthen this skirt, please"
2. lengthen
become long or longer
"In Spring, the days lengthen"
Source: WordNet® (An amazing lexical database of English)
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