Wordnet 3.0
NOUN (2)
1. 
 a member of a people native to the Philippines chiefly inhabiting central Luzon around and including Manila; 
2. 
 the language of the Tagalog on which Filipino is based; 
The Collaborative International Dictionary of English v.0.48:
Tagalog \Ta*ga"log\, n.
   1. (Ethnol.) Any member of a certain tribe which is one of
      the leading and most civilized of those native of the
      Philippine Islands.
      [Webster 1913 Suppl.]
   2. The language of the Tagalogs. It belongs to the Malay
      family of languages and is one of the most highly
      developed members of the family.
      [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
Tagalog
    n 1: a member of a people native to the Philippines chiefly
         inhabiting central Luzon around and including Manila
    2: the language of the Tagalog on which Filipino is based