Source : Webster's Revised Unabridged Dictionary (1913)

Humanitarian \Hu*man`i*ta"ri*an\, n. [From {Humanity}.]
   1. (Theol. & Ch. Hist.) One who denies the divinity of
      Christ, and believes him to have been merely human.

   2. (Philos.) One who limits the sphere of duties to human
      relations and affections, to the exclusion or
      disparagement of the religious or spiritual.

   3. One who is actively concerned in promoting the welfare of
      his kind; a philanthropist. [Recent]

Humanitarian \Hu*man`i*ta"ri*an\, a.
   1. (Theol. & Ch. Hist.) Pertaining to humanitarians, or to
      humanitarianism; as, a humanitarian view of Christ's
      nature.

   2. (Philos.) Content with right affections and actions toward
      man; ethical, as distinguished from religious; believing
      in the perfectibility of man's nature without supernatural
      aid.

   3. Benevolent; philanthropic. [Recent]

Source : WordNet®

humanitarian
     adj 1: marked by humanistic values and devotion to human welfare;
            "a humane physician"; "released the prisoner for
            humanitarian reasons"; "respect and humanistic regard
            for all members of our species" [syn: {human-centered},
             {human-centred}, {humanist}, {humanistic}]
     2: of or relating to or characteristic of humanitarianism;
        "humanitarian aid"

humanitarian
     n : someone devoted to the promotion of human welfare and to
         social reforms [syn: {do-gooder}, {improver}]