From a quick investigation of the current MMORPG Tycoon 2 codebase, I discovered:

• hilite : 189 instances
• hilight:  103 instances
• highlight (the correct spelling):  3 instances

One of which was this:  “float m_hilightLength; // how long is my highlight?”

And to think that I thought I was a stickler for spelling in my codebases!  Fixing it now.  :)