Lewis & Short

adjectĭo, ōnis, f. [adjicio], an adding to, addition, annexation.

  1. I. In gen.: Romana res adjectione populi Albani aucta, Liv. 1, 30: illiberalis, a small addition, id. 38, 14 ext.: caloris, Sen. Ep. 189: litterarum, Quint. 1, 5, 16; also the permission of adding, etc. (cf.: accessus, aditus): Hispalensibus familiarum adjectiones dedit, he granted to them the right of settling new families, Tac. II. 1, 78.
    More freq.,
  2. II. Esp., as t. t.
    1. A. In archit.
      1. 1. A projection in the pedestal of columns, the cornice of the pedestal, Vitr. 3, 2.
    2. B. In medicine, a strengthening, invigorating remedy: quae (i. e. diseases) non detractionibus, sed adjectionibus curantur, Vitr. 1, 6, 3.
    3. C. In rhet., the repetition of the same word, e. g. occidi, occidi, Quint. 9, 3, 28 (in Cic., adjunctio, q. v.).
    4. D. In auctions, the addition to a bid, Dig. 18, 2, 17 al.; cf. adjicio.