1 (pl. geniuses) a an exceptional intellectual or creative power or other natural ability or tendency. b a person having this.
2 the tutelary spirit of a person, place, institution, etc.
3 a person or spirit regarded as powerfully influencing a person for good or evil.
4 the prevalent feeling or associations etc. of a nation, age, etc.
Etymology: L (in sense 2) f. the root of gignere beget
Useful english dictionary. 2012.