Revelation of Jesus Christ
From the KJV 1611 with Strong's Concordance
H7307
רוּחַַ
ruwach
{roo-akh'}
From H7306; wind; by resemblance breath, that is, a sensible (or even violent) exhalation; figuratively life, anger, unsubstantiality; by extension a region of the sky; by resemblance spirit, but only of a rational being (including its expression and functions).
NOTE: Used widely throughout the Old Testament (below are the usages from Daniel only).