- vital [vīt′'l]adj.[ME < MFr < L vitalis, vital < vita, life, akin to vivere, to live: see BIO-]1. of, concerned with, or manifesting life [vital energy]2.a) necessary or essential to life; being a source or support of life [vital organs]b) affecting, esp. destroying, life; critical, esp. fatal [a vital wound]3.a) essential to the existence or continuance of something; indispensable [a vital function]b) of crucial importance [a vital matter]4. affecting the validity, truth, etc. of something [a vital error]5. full of life and vigor; energetic [a vital personality]n.[pl.]1. the vital organs, as the heart, brain, lungs, etc.2. the essential parts of anything, indispensable for its existence, continuance, etc.SYN.- LIVINGvitallyadv.
English World dictionary. V. Neufeldt. 2014.