1 of or relating to longitude or length
2 placed or extended lengthways
3 (Psychol) (of a study of behaviour) carried on over a protracted period of time
n a wave that is propagated in the same direction as the displacement of the transmitting medium
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"