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Definition of lengthiness : The state or quality of being lengthy; prolixity.

Synonyms:

file name extension, continuation, continuance, law of continuation, good continuation, university extension, extension service, denotation, telephone extension, annex, reference, lengthening, propagation, annexe, protraction, extension, sequel, prolongation, perpetuation, extension phone, elongation, wing, filename extension

durability (part of speech: noun)

everlastingness, endurance, interminability, lastingness, perpetuity, durability

wordiness (part of speech: noun)

superfluity, talkativeness, bombast, endlessness, loquaciousness, chattiness, ponderousness, grandiloquence, excessiveness, verbosity, featherbedding, windiness, wordiness, verbalism

lengthiness (part of speech: noun)

extensiveness, longness

Usage examples: