In a manner relating to construction or the way something is built; from the perspective of how something is assembled or structured.
From constructional (construction + -al) + -ly (adverb suffix). This is a tertiary formation showing how English builds longer words by stacking suffixes systematically.
While this word is rarely used in everyday speech, it appears in technical writing about linguistics and architecture when specialists need to emphasize the 'how it's built' aspect rather than the result.
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