Lewis & Short

allĭgātĭo (adl-), ōnis, f. [alligo].

  1. I. A binding or tying to (only in the foll. exs.): arbustorum, Col. 11, 2.
    Hence,
  2. II. Abstr. pro concr., a band, Vitr. 8, 7 med.; so id. 7, 3.