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Origin of dialectal

First recorded in 1825–35; dialect + -al1
Related formsdi·a·lec·tal·ly, adverbin·ter·di·a·lec·tal, adjectivein·ter·di·a·lec·tal·ly, adverbnon·di·a·lec·tal, adjectivenon·di·a·lec·tal·ly, adverbsub·di·a·lec·tal, adjectivesub·di·a·lec·tal·ly, adverb
Can be confuseddialectal dialectic dialectical (see usage note at the current entry)

Usage note

In linguistics dialectal, not dialectical, is the term more commonly used to denote regional or social language variation: Dialectal variation is more marked in the South than elsewhere in the United States. In general writing either term may be found.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for dialectal

Historical Examples of dialectal

Word Origin and History for dialectal

1831, from dialect + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper