Detailed Instructions: In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
Q: Aerodrome is a collective term for any location from which flying operations take place , although more specific terminology can be used to characterise its purpose . The CAA strategic review of GA applies the term airport to locations which predominantly support large scale commercial operations , and airfield to locations which predominantly support GA operations . The General Aviation Small Aerodrome Research Study ( GASAR ) analysed 687 aerodromes in England which come under the scope of GA , classifying 374 into six types . These range in size from regional airports to the smallest farm strip , although 84 per cent of GA flights operate from 134 of the larger aerodromes in the first four categories .fill in the blank :Aerodrome is a collective term for any location from which flying operations take place , although more specific terminology can be used to __________________ its purpose . 
A:
 characterise 