To excite or stimulate; to rouse to action or emotion (archaic or formal usage).
Directly from Latin 'excitare' (to rouse, to stir up). This is an older or more formal version of the verb 'excite.' In modern English, 'excitate' has largely been replaced by 'excite,' but it persists in some scientific contexts.
This is basically an old-fashioned version of 'excite' that sounds very formal—you might find it in 19th-century scientific papers where scientists were still deciding which Latin-based terms to keep.
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