[1] : The Collaborative International Dictionary of English v.0.48

ya \ya\ yaum, adv.
   yea. obs. --chaucer.
   1913 webster

[2] : Jargon File (4.3.1, 29 Jun 2001)

ya- abbrev. yet another in hackish acronyms this almost invariably
   expands to yet another, following the precedent set by unix `yacc1'
   yet another compiler-compiler. see yaba.


see also:
yet another yaba 

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

ya-
     
        yet another
     
     
see also:
yet another 

Ya- >> Y Words
Ya-, definition of term: Ya-
ya-_pag1.html