1) Botanical nomenclature 2) In the meaning of 
in the sense of.
Sensu is a Latin word meaning `in the sense of`. It is used in a number of fields including biology, geology, linguistics, and law. Commonly it refers to how strictly or loosely an expression is used in describing any particular concept, but it also appears in expressions that indicate the convention or context of the usage. ==Common qualifiers=.....
A folding fan
in the sense of some author
As defined by.