Lewis & Short

partĭcĭpĭum, ii, n. [particeps], a sharing, partaking, participation.

  1. I. Lit. (post-class.): omni ad illa participio in posterum abstinere, Cod. Just. 1, 4, 34, § 3.
    Far more freq.,
  2. II. Transf., in gram., a verbal form which partakes of the functions of a noun, a participle, Varr. L. L. 8, § 58; 9, § 110 Müll.; Quint. 1, 4, 19; 27; 1, 5, 47 et saep.