The paper contains syntactic and semantic analysis of the expression 'z osobna'. The examined sequence is indivisible into meaningful parts. The main hypothesis which has been justified in the paper is as follows. 'Z osobna' is not a separate unit of language; it is only a part of multiple ones, namely 'kazdy X z osobna', 'zaden X z osobna', 'poszczegolne Xs z osobna'. They represent a class of adjectives. In order to point out a grammatical and semantic status of the expression 'z osobna', differences between the sequence under examination and the adverb 'osobno' are described. The latter one is a separate linguistic unit. The distinguished adjectives of the type 'kazdy X z osobna' refer to an unlimited number of objects of the same kind but what is said in a given utterance refers to each object independently of the other ones. This is a relevant semantic feature of the unit described in the paper.