noun (n)

• military installation consisting of a prepared position for siting a weapon(noun.artifact)

  source: wordnet30
• the act of putting something in a certain place(noun.act)

  Synonym:
  locating, location, placement, position, positioning
  

  source: wordnet30
• A putting in, or assigning to, a definite place; localization; as, the emplacement of a structure.(noun)

  source: webster1913