1. 
   sighting
   [n] - the act of observing
   Found op http://www.webdictionary.co.uk/definition.php?query=sighting
   
   
2. 
   Sighting
   Sight'ing adjective & noun from Sight , transitive verb Sighting shot , a shot made to ascertain whether the sights of a firearm are properly adjusted; a trial shot.
   Found op http://www.encyclo.co.uk/webster/S/100
   
   
3. 
   sighting
   noun the act of observing; `several sightings of enemy troops were reported`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=sighting
   
   
4. 
   Sighting
   • (p. pr. & vb. n.) of Sight • a. & n. from Sight, v. t.
   Found op http://thinkexist.com/dictionary/meaning/sighting/
   
   
5. 
   sighting
   1) Observance 2) Observation 3) The act of observing 4) Watching
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/sighting/1
   
   

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