1. 
   semestral
   [adj] - occurring every 6 months or during each 6-month period
   Found op http://www.webdictionary.co.uk/definition.php?query=semestral
   
   
2. 
   semestral
   semestrial adjective occurring every six months or during every period of six months
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=semestral
   
   
3. 
   semestral
   1) Occurring every 6 months or during each 6-month period 2) Period 3) Period of time 4) Semestrial 5) Time period
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/semestral/1
   
   

Tip: double click on a word to show its meaning.