The Collaborative International Dictionary of English v.0.48:

Inaugural \In*au"gu*ral\, a. [Cf. F. inaugural.]
   Pertaining to, or performed or pronounced at, an
   inauguration; as, an inaugural address; the inaugural
   exercises.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inaugural \In*au"gu*ral\, n.
   An inaugural address. [U.S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

inaugural
    adj 1: occurring at or characteristic of a formal investiture or
           induction; "the President's inaugural address"; "an
           inaugural ball" [ant: exaugural]
    2: serving to set in motion; "the magazine's inaugural issue";
       "the initiative phase in the negotiations"; "an initiatory
       step toward a treaty"; "his first (or maiden) speech in
       Congress"; "the liner's maiden voyage" [syn: inaugural,
       initiative, initiatory, first, maiden]
    n 1: an address delivered at an inaugural ceremony (especially
         by a United States president) [syn: inaugural address,
         inaugural]
    2: the ceremonial induction into a position; "the new president
       obviously enjoyed his inauguration" [syn: inauguration,
       inaugural]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "inaugural":
   abecedarian, aboriginal, address, advanced, after-dinner speech,
   allocution, antecedent, antenatal, anterior, autochthonous,
   avant-garde, baccalaureate service, beginning, budding,
   celebration, ceremonial, ceremony, chalk talk, chief, commencement,
   convocation, creative, debate, declamation, diatribe, elemental,
   elementary, embryonic, empty formality, eulogy, exercise,
   exercises, exhortation, exordial, exploratory, fetal, filibuster,
   first, foremost, forensic, forensic address, formal, formal speech,
   formality, formative, foundational, function, fundamental,
   funeral oration, gestatory, graduation, graduation exercises,
   harangue, headmost, hortatory address, in embryo, in its infancy,
   in the bud, inaugural address, inauguration, inceptive, inchoate,
   inchoative, incipient, incunabular, induction, infant, infantile,
   initial, initiation, initiative, initiatory, installation,
   introductory, invective, inventive, investiture, jeremiad, leading,
   liturgy, mummery, nascent, natal, observance, office, oration,
   original, parturient, pep talk, performance, peroration, philippic,
   pitch, postnatal, precedent, preceding, precessional, precursory,
   prefatory, pregnant, preliminary, preludial, prelusive, prenatal,
   preparatory, prepared speech, prepared text, prevenient, primal,
   primary, prime, primeval, primitive, primogenial, prior,
   procreative, proemial, propaedeutic, public speech, reading,
   recital, recitation, religious ceremony, rite, rite de passage,
   rite of passage, ritual, rudimental, rudimentary, sales talk,
   salutatory, salutatory address, say, screed, service, set speech,
   solemnity, solemnization, speech, speechification, speeching, talk,
   talkathon, tirade, ur, valediction, valedictory,
   valedictory address