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unidirectionality (yōōˈ·nē·d·rekˈ·sh·naˑ·li·tē),

n the notion that reality is contained within an immutable, linear time-space continuum, in which past precedes present, which in turn precedes future.
References in periodicals archive ?
Traugott (2001: 13) further notes that "it is probable that some of the most important counterexamples [to unidirectionality of grammaticalization] will turn out to be instances of exaptation".
However, it should be clear from details of the exposition in this article that his assertion that category reanalysis / adaptation and exaptation are so different from grammaticalization that counterdirectional instances of them do not amount to counterexamples to unidirectionality is not justified.
Kiparsky (2004) suggests that "apparent exceptions [to the unidirectionality of grammaticalization] are really instances of analogical change".
18) As stated in Section 1 of the present review article, I am not going to repeat the question of unidirectionality in G, for which references were already given.
On directionality in language change: with particular reference to unidirectionality in grammaticalization.
The alleged unidirectionality of grammaticalization vs.
1990 "From less to more situated in language: the unidirectionality of semantic change", in: Sylvia Adamson -- Vivien Law -- Nigel Vincent -- Susan Wright (eds.
Of course, the view that reduction is the main motivation for periphrasis has been very widespread, but to my knowledge, it has never been advanced as an explanation of unidirectionality before Geurts.
that degrammaticalizing changes do not occur because their outcome would be unpredictable) is crucial if one wants to explain unidirectionality without extravagance.