1. The process or action of making something longer in duration or physical extent
The lengthening of the days after winter solstice is a natural phenomenon.
O alongamento dos dias após o solstício de inverno é um fenômeno natural.
2. In phonetics, the extension of a vowel sound
The lengthening of vowels can change the meaning of words in some languages.
O alongamento de vogais pode alterar o significado de palavras em alguns idiomas.
3. In textiles or construction, the process of extending material or structure
The lengthening of the bridge required additional support beams.
O alongamento da ponte exigiu vigas de suporte adicionais.