Easton's Bible Dictionary (1897)/Spirit
Spirit (Heb. ruah; Gr. pneuma), properly wind or breath. In 2 Thess. 2:8 it means "breath," and in Eccl. 8:8 the vital principle in man. It also denotes the rational, immortal soul by which man is distinguished (Acts 7:59; 1 Cor. 5:5; 6:20; 7:34), and the soul in its separate state (Heb. 12:23), and hence also an apparition (Job 4:15; Luke 24:37, 39), an angel (Heb. 1:14), and a demon (Luke 4:36; 10:20). This word is used also metaphorically as denoting a tendency (Zech. 12:10; Luke 13:11).
In Rom. 1:4, 1 Tim. 3:16, 2 Cor. 3:17, 1 Pet. 3:18, it designates the divine nature.