Forgive me whilst I ponder

I was putting together a Keynote presentation this evening, it included a quote that contained the word "whilst". Keynote put the red squiggly line underneath it, indicating that it was either misspelled or that it wasn't in the dictionary. In order to double check the spelling, I opened the Mac OS X Dictionary and it had the word and definition, whilst.

indextop20050622


I wonder why it is that the Mac OS X dictionary contains words that are not in the spelling function of programs from Apple? Don't they utilize the same dictionary?

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