The Collaborative International Dictionary of English v.0.48:

Tagal \Ta*gal"\, n.
   1. One of a Malayan race, mainly of central Luzon, next to
      the Visayans the most numerous of the native peoples of
      the Philippines. Nearly all are Christians and many are
      highly educated.
      [Webster 1913 Suppl.]

   2. The language of the Tagals; Tagalog.
      [Webster 1913 Suppl.]