Lewis & Short

functĭo, ōnis, f. [fungor], a performing, executing, discharging; a performance, execution.

  1. I. In gen. (Ciceron., but very rare): labor est functio quaedam vel animi vel corporis gravioris operis et muneris, Cic. Tusc. 2, 15, 35: ut iis jucundior esset muneris illius functio, id. Verr. 2, 3, 6, § 15.
    1. * B. Transf., of things: functionem recipere per solutionem, i. e. perform the part, supply the place of, Dig. 12, 1, 2, § 1.
  2. II. In partic. (post-class.).
    1. A. Payment of taxes, Cod. Just. 8, 54, 4; 10, 22, 3.
    2. B. An ending, end (of life), death: inevitabilis, Arn. 2, 78: mortalium, id. 2, 104.