1. To twinkle rapidly as of stars. When stars are scintillating it is a result of constantly small changes in the atmosphere's density.
2. To express, emit, or to incite liveliness: To scintillate a conversation or performance results in it being much more interesting.
3. Etymology: from Latin scintillare, "to sparkle, to flash." © ALL rights are reserved.

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A well-known "scintillating" poem

Scintillate, scintillate, globule vivific!

Fain would I fathom thy nature specific,

Distantly poised in the ether capacious,

Closely resembling a gem carbonaceous.

Do you have a problem understanding this sesquipedalian version? If so, here it is in a simple format.

Twinkle, twinkle, little star!

How I wonder what you are,

Up above the world so high,

Like a diamond in the sky.