| That's just semantics. The wording doesn't change the operations which are going on in the engine. Either way, a wankel engine is is not 2 or 3 cycle. It's a full 4 cycle engine since each of the functions takes place in a seperate operation like on a 4 stroke piston engine, unlike on a 2 stroke piston engine where the 4 operations are blended together to take place in only 2 stokes. At first sight it may seem that the rotary would have 3 cycles since there are 3 sides to the rotor. But the rotor doesn't really spin, it's more of a wobble, and the space between the sides of the rotors and sides of the housing make up 4 different chambers, each performing one distinct function. Nice animation on this page: [ http://travel.howstuffworks.com/rotary-engine4.htm ] I know you're familiar with how they work, but other readers may like to see the animation to get a better idea of it. 
And for your amusement:
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