The Collaborative International Dictionary of English v.0.48:

Collocation \Col`lo*ca"tion\, n. [L. collocatio.]
   1. The act of placing; the state of being placed with
      something else; disposition in place; arrangement.
      [1913 Webster]

            The choice and collocation of words.  --Sir W.
                                                  Jones.
      [1913 Webster]

   2. (Linguistics) a combination of related words within a
      sentence that occurs more frequently than would be
      predicted in a random arrangement of words; a combination
      of words that occurs with sufficient frequency to be
      recongizable as a common combination, especially a pair of
      words that occur adjacent to each other. Also called
      stable collocation. Combinations of words having
      intervening words between them, such as verb and object
      pairs, may also be collocations.
      [PJC]

WordNet (r) 3.0 (2006):

collocation
    n 1: a grouping of words in a sentence
    2: the act of positioning close together (or side by side); "it
       is the result of the juxtaposition of contrasting colors"
       [syn: juxtaposition, apposition, collocation]

The Free On-line Dictionary of Computing (30 December 2018):

co-location
collocation

    /koh'loh-kay`sh*n/ or /koh`loh-kay'sh*n/ (Or
   "colocation") Providing network connections such as Internet
   leased lines to several servers housed together in a
   server room.  This is typically provided as a commercial
   service.

   The hyphenated form is correct and the most common on the web,
   followed by "colocation".  "collocation" (/ko`loh-kay'sh*n/,
   not /koh'-/), is an old word with a similar meaning.  It is
   common in dictionaries and follows the pattern of other
   Latin-derived words like collect, college, and collate, but is
   least common on the web.

   The verbal form is "to colocate" or "co-locate" (commonly
   /koh'loh`kayt/, also (US) /koh`loh'kayt/).

   (2000-10-03)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

COLLOCATION, French law. The act by which the creditors of an estate are
arranged in the order in which they are to be paid according to law. The
order in which the creditors-are placed, is also called collocation. Merl.
Rep. h.t. Vide Marshalling Assets.