Definition: needs

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Source: WordNet (r) 1.7 

needs
     adv : in such a manner as could not be otherwise; "it is
           necessarily so"; "we must needs by objective" [syn: inevitably,
            necessarily, of necessity]

Source: Webster's Revised Unabridged Dictionary (1913) 

Needs \Needs\, adv. [Orig. gen. of need, used as an adverb. Cf.
   -wards.]
   Of necessity; necessarily; indispensably; -- often with must,
   and equivalent to of need.

         A man must needs love mauger his head.   --Chaucer.

         And he must needs go through Samaria.    --John iv. 4.

         He would needs know the cause of his reulse. --Sir J.
                                                  Davies.