specific

A distinguishing attribute or quality.

A remedy for a specific disease or condition.

Specification

(in the plural) The details; particulars.

Explicit or definite

Pertaining to a species.

Pertaining to a taxon at the rank of species

Special, distinctive or unique

Intended for, or applying to, a particular thing

Serving to identify a particular thing (often a disease or condition), with little risk of mistaking something else for it.

“a highly specific test, specific and nonspecific symptoms”

Being a remedy for a particular disease

“Quinine is a specific medicine in cases of malaria.”

Limited to a particular antibody or antigen

Of a value divided by mass (e.g. specific orbital energy)

Similarly referring to a value divided by any measure which acts to standardize it (e.g. thrust specific fuel consumption, referring to fuel consumption divided by thrust)

A measure compared with a standard reference value by division, to produce a ratio without unit or dimension (e.g. specific refractive index is a pure number, and is relative to that of air)