| (sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique | radically distinctive and without equal |
| being or affecting a disease produced by a particular microorganism or condition; used also of stains or dyes used in making microscope slides | the single one of its kind |
| relating to or distinguishing or constituting a taxonomic species | (followed by `to') applying exclusively to a given category or condition or locality |
| stated explicitly or in detail | highly unusual or rare but not the single instance |