Source : Webster's Revised Unabridged Dictionary (1913)

Impersonal \Im*per"son*al\, n.
   That which wants personality; specifically (Gram.), an
   impersonal verb.

Impersonal \Im*per"son*al\, a. [L. impersonalis; pref. im- not +
   personalis personal: cf. F. impersonnel. See {Personal}.]
   Not personal; not representing a person; not having
   personality.

         An almighty but impersonal power, called Fate. --Sir J.
                                                  Stephen.

   {Impersonal verb} (Gram.), a verb used with an indeterminate
      subject, commonly, in English, with the impersonal pronoun
      it; as, it rains; it snows; methinks (it seems to me).
      Many verbs which are not strictly impersonal are often
      used impersonally; as, it goes well with him.

Source : WordNet®

impersonal
     adj 1: not relating to or responsive to individual persons; "an
            impersonal corporation"; "an impersonal remark" [ant:
            {personal}]
     2: having no personal preference; "impersonal criticism"; "a
        neutral observer" [syn: {neutral}]