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"

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "immanent":
   accessible, actual, as is, at hand, attendant, available, being,
   contemporaneous, contemporary, current, deep-seated, esoteric,
   existent, existing, extant, fresh, immediate, implanted, implicit,
   in view, inalienable, indwelling, infixed, ingrained, inherent,
   inner, instant, internal, intrinsic, inward, inwrought,
   irreducible, latest, modern, new, on board, on deck, on hand,
   present, present-age, present-day, present-time, private, resident,
   running, secret, subjective, that be, that is, topical,
   unalienable, unchallengeable, unquestionable, up-to-date,
   up-to-the-minute, within call, within reach, within sight