The Collaborative International Dictionary of English v.0.48:

Immerse \Im*merse"\, a. [L. immersus, p. p. of immergere. See
   Immerge.]
   Immersed; buried; hid; sunk. [Obs.] "Things immerse in
   matter." --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Immerse \Im*merse"\, v. t. [imp. & p. p. Immersed; p. pr. &
   vb. n. Immersing.]
   1. To plunge into anything that surrounds or covers,
      especially into a fluid; to dip; to sink; to bury; to
      immerge.
      [1913 Webster]

            Deep immersed beneath its whirling wave. --J Warton.
      [1913 Webster]

            More than a mile immersed within the wood. --Dryden.
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   2. To baptize by immersion.
      [1913 Webster]

   3. To engage deeply; to engross the attention of; to involve;
      to overhelm.
      [1913 Webster]

            The queen immersed in such a trance.  --Tennyson.
      [1913 Webster]

            It is impossible to have a lively hope in another
            life, and yet be deeply immersed inn the enjoyments
            of this.                              --Atterbury.
      [1913 Webster]

WordNet (r) 3.0 (2006):

immerse
    v 1: thrust or throw into; "Immerse yourself in hot water" [syn:
         immerse, plunge]
    2: devote (oneself) fully to; "He immersed himself into his
       studies" [syn: steep, immerse, engulf, plunge,
       engross, absorb, soak up]
    3: enclose or envelop completely, as if by swallowing; "The huge
       waves swallowed the small boat and it sank shortly
       thereafter" [syn: immerse, swallow, swallow up, bury,
       eat up]
    4: cause to be immersed; "The professor plunged his students
       into the study of the Italian text" [syn: plunge,
       immerse]