The Collaborative International Dictionary of English v.0.48:

Interim \In"ter*im\, n. [L., fr. inter between + im, an old
   accusative of is he, this, that.]
   [1913 Webster]
   1. The meantime; time intervening; interval between events,
      etc.
      [1913 Webster]

            All the interim is
            Like a phantasms, or a hideous dream. --Shak.
      [1913 Webster]

   2. (Hist.) A name given to each of three compromises made by
      the emperor Charles V. of Germany for the sake of
      harmonizing the connecting opinions of Protestants and
      Catholics.
      [1913 Webster]

WordNet (r) 3.0 (2006):

interim
    adj 1: serving during an intermediate interval of time; "an
           interim agreement"
    n 1: the time between one event, process, or period and another;
         "meanwhile the socialists are running the government" [syn:
         interim, meantime, meanwhile, lag]

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "interim":
   abeyance, acting, ad interim, afterthought, bind, block, blockage,
   breach, break, bureaucratic delay, caesura, cease-fire, cessation,
   clearance, day off, delay, delayage, delayed reaction, detention,
   discontinuity, distance between, double space, double take,
   dragging, drop, em space, en space, fissure, freeboard, gap,
   hair space, half space, halt, hang-up, hesitation, hiatus,
   hindrance, holdup, holiday, interlude, intermediate space,
   intermezzo, intermission, intermittence, interruption, interspace,
   interstice, interval, jam, jump, lacuna, lag, lagging, lapse,
   layoff, leap, leeway, letup, logjam, lull, margin, moratorium,
   obstruction, paperasserie, pause, pro, provisional, provisory,
   recess, red tape, red-tapeism, red-tapery, remission, reprieve,
   respite, rest, retardance, retardation, room, single space,
   slow-up, slowdown, slowness, space, space between, stand-down,
   stay, stay of execution, stop, stoppage, supply, suspension,
   temporary, tentative, tie-up, time interval, time lag, truce,
   vacation, wait



Bouvier's Law Dictionary, Revised 6th Ed (1856):

INTERIM. In the mean time; in the meanwhile. For example, one appointed
between the time that a person is made bankrupt, to act in the place of the
assignee until the assignee shall be appointed, is an assignee ad interim. 2
Bell's Com. 355.