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vital 
1  adj If you say that something is vital, you mean that it is necessary or very important.  (=crucial) 
The port is vital to supply relief to millions of drought victims...  
 vitally  adv 
Lesley's career in the church is vitally important to her.  
2  adj If you describe someone or something as vital, you mean that they are very energetic and full of life.  (=lively) 
They are both very vital people and a good match...  


vital signs  
The vital signs of a seriously ill person are the things such as their blood pressure and temperature which show that they are alive.  n-plural 
vital statistics 
1  n-plural The vital statistics of a population are statistics such as the number of births, deaths, or marriages which take place in it. 
2  n-plural Someone's vital statistics, especially a woman's, are the measurements of their body at certain points, for example at their chest, waist, and hips.