（１）Information Retrieval

Indexing Exhaustivity（标引详尽度）[1]： The indexing exhaustivity of a document description is the coverage of its various topics given by the terms assigned to it.

Term Specificity（词语专指度）[1]: The specificity of an individual term is the level of detail at which a given concept is represented.

References

[1] Sparck Jones, K. A statistical interpretation of term specificity and its application to retrieval [J]. Journal of documentation, 1972, 28(1): 11-21.