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The FOV visible to the human eye at the eyepiece is 100 degrees (for that eyepiece). What you see within that field of view depends on the magnification, as Daniel explained.
Apparent FOV = what you see at the eyepiece. It does not change with magnification or what scope you put it in. It is an inherent characteristic of the eyepiece design. A small AFOV is like looking down a narrow tube, while a wide AFOV is possibly wider than the human eye can take in at once.
True FOV = what appears in your FOV as determined by the magnification and AFOV of the eyepiece. At high magnification the TFOV will be much smaller.
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