Among the syntactic entities postulated in Integrational Syntax for the syntactic part of arbitrary idiolect systems, there are: syntactic base forms, syntactic units, syntactic paradigms, lexical words, syntactic categories (either syntactic unit categories or word categories), syntactic structures, and syntactic functions. A syntactic unit of an idiolect system is a sequence of syntactic base forms. (Again, unit sequences, but not the empty sequence, are allowed as a limiting case of syntactic units, that is, a syntactic unit may contain a single syntactic base form.) In a system of a spoken idiolect, the syntactic base forms are precisely the phonological words occurring in the phonological part of the system (analogously, for systems of written and signed idiolects). It is an essential feature of Integrational Syntax that a clear distinction is made between lexical words and forms of lexical words (called 'syntactic word forms' or simply 'syntactic words'): every lexical word is an ordered pair consisting of a syntactic paradigm or 'word paradigm' (the form component of the word) and a concept that is a meaning of the paradigm (the meaning component of the word); a syntactic paradigm is a (non-empty) set of pairs, each consisting of a syntactic word form and a 'categorization' of the word form, that is, a set of syntactic categories such that the word form is an element of each category in the set; and any syntactic word form is also a syntactic unit, hence, a sequence (possibly, a unit sequence) of syntactic base forms (phonological words in the case of spoken idiolects). A given syntactic word form may combine with several categorizations within a single paradigm (syncretism); and a single paradigm may have a number of different meanings (polysemy), which leads to the same number of different lexical words (identical in their form components). Both the notion of paradigm and the notion of concept are generalized so as to allow for lexical words also where traditionally one would not speak either of a paradigm or of a lexical meaning. Given the distinction between syntactic units (including syntactic word forms) and lexical words, two main types of syntactic categories are postulated for the syntactic part of any idiolect system. Type 1 syntactic categories (also called 'syntactic unit categories') are sets of syntactic units of the idiolect system, and include the syntactic constituent categories as well as word form categories like cases, numbers, tenses, and definiteness categories.