1
a
: an extension or lengthening in time or duration
the indefinite prolongation of the Korean truce talks—
Joseph & Stewart Alsop
b
: the continuation or protraction of a spoken syllable or sound
the principle of prolongation—
H. W. Smyth
2
: an expansion or continuation in extent, scope, or range
a northwesterly prolongation into the plain of Lancastria—
L. D. Stamp a prolongation of ourselves—
Times Literary Supplement water and plants … became a part and prolongation of the structures conceived by the architect—
José Gómez-Sicre treats literature … as a prolongation (of the past) rather than as an original creation—
Wallace Fowlie
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Merriam-Webster unabridged
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