Collocate spans of adverbials configure their semantic representations in discourse. Various models aim to improve the functional classification of adverbials, but little attention has been devoted to the dynamic interaction of lexical features between collocate spans and semantic vectors. This study identifies and quantifies the connectivity between lexical features and pragmatic inferences encoded by adverbials to deliver semantic representations of truth conditions, i.e. veridicality. It proposes a dynamic span vector model that measures the distances between default semantic representations and contextual pragmatic realizations by calculating the vectors of evidentiality and stance among collocate spans of modal adverbials from eight domain-specific corpora. The norm-referenced setting of semantic vectors in collocate spans offers a self-contained approach to accessing and assessing veridicality across diverse language experiences.