The Collaborative International Dictionary of English v.0.48:

Immanent \Im"ma*nent\, a. [L. immanens, p. pr. of immanere to
   remain in or near; pref. im- in + manere to remain: cf. F.
   immanent.]
   Remaining within; inherent; indwelling; abiding; intrinsic;
   internal or subjective; hence, limited in activity, agency,
   or effect, to the subject or associated acts; -- opposed to
   emanant, transitory, transitive, or objective.
   [1913 Webster]

         A cognition is an immanent act of mind.  --Sir W.
                                                  Hamilton.
   [1913 Webster]

         An immanent power in the life of the world. --Hare.
   [1913 Webster]

WordNet (r) 3.0 (2006):

immanent
    adj 1: of a mental act performed entirely within the mind; "a
           cognition is an immanent act of mind" [syn: immanent,
           subjective] [ant: transeunt, transient]
    2: of qualities that are spread throughout something; "ambition
       is immanent in human nature"; "we think of God as immanent in
       nature"