ADJECTIVE (2)

1. added or derived from something outside; not inherent;
- Example: "an adscititious habit rather than an inherent taste"

2. supplemental; not part of the real or essential nature of a thing;
- Example: "adscititious vowels"

The Collaborative International Dictionary of English v.0.48:

Adscititious \Ad`sci*ti"tious\, a. [L. adscitus, p. p. of
   adsciscere, asciscere, to take knowingly; ad + sciscere to
   seek to know, approve, scire to know.]
   Supplemental; additional; adventitious; ascititious.
   "Adscititious evidence." --Bowring. -- Ad`sci*ti"tious*ly,
   adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adscititious
    adj 1: added or derived from something outside; not inherent;
           "an adscititious habit rather than an inherent taste"
    2: supplemental; not part of the real or essential nature of a
       thing; "adscititious vowels"