Pronunciation: (depth),[key] —n. 1. a dimension taken through an object or body of material, usually downward from an upper surface, horizontally inward from an outer surface, or from top to bottom of something regarded as one of several layers.
2. the quality of being deep; deepness.
3. complexity or obscurity, as of a subject: a question of great depth. 4. gravity; seriousness.
5. emotional profundity: the depth of someone's feelings. 6. intensity, as of silence, color, etc.
7. lowness of tonal pitch: the depth of a voice. 8. the amount of knowledge, intelligence, wisdom, insight, feeling, etc., present in a person's mind or evident either in some product of the mind, as a learned paper, argument, work of art, etc., or in the person's behavior.
9. a high degree of such knowledge, insight, etc.
10. Often, depths. a deep part or place: from the depths of the ocean. 11. an unfathomable space; abyss: the depth of time. 12. Sometimes, depths. the farthest, innermost, or extreme part or state: the depth of space; the depths of the forest; the depths of despair. 13. Usually, depths. a low intellectual or moral condition: How could he sink to such depths? 14. the part of greatest intensity, as of night or winter.
15. Sports.the strength of a team in terms of the number and quality of its substitute players: With no depth in the infield, an injury to any of the regulars would be costly. 16. in depth, extensively or thoroughly: Make a survey in depth of the conditions. 17. out of or beyond one's depth. a. in water deeper than one's height or too deep for one's safety.
b. beyond one's knowledge or capability: The child is being taught subjects that are beyond his depth.