n.

1. Multiplication or increase, as by natural reproduction.
2. The process of spreading to a larger area or greater number; dissemination.
3. Physics. The act or process of propagating, especially the process by which a disturbance, such as the motion of electromagnetic or sound waves, is transmitted through a medium such as air or water.

propagational prop'a·ga'tion·al adj.

The transmission (spreading) of signals from one place to another.

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noun

The process by which an organism produces others of its kind: breeding, multiplication, procreation, proliferation, reproduction, spawning. Obsolete increase. See reproduction/barrenness.

(prop′ə-gā′shən)
n

The reproduction or continuance of an impulse along a nerve fiber in an afferent or efferent direction.

Travelling of electromagnetic, electrical or sound waves through a medium.

IN BRIEF: The act of increasing or spreading something.

Plant propagation is an important part of creating more plants to sell in nurseries.

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Dansk (Danish)
n. - forplantning, formering, udbredelse, overførsel

Nederlands (Dutch)
verspreiding, teling, voortplanting

Français (French)
n. - propagation

Deutsch (German)
n. - Verbreitung, Vermehrung

Ελληνική (Greek)
n. - πολλαπλασιασμός, αναπαραγωγή, διάδοση (του φωτός κ.λπ.), διασπορά

Italiano (Italian)
distribuzione, propagazione, procreazione

Português (Portuguese)
n. - propagação (f)

Русский (Russian)
размножение, распространение

Español (Spanish)
n. - propagación, difusión, divulgación, multiplicación

Svenska (Swedish)
n. - förökning, fortplantning, spridning, överföring

中文（简体） (Chinese (Simplified))
增殖, 广传, 繁殖

中文（繁體） (Chinese (Traditional))
n. - 增殖, 廣傳, 繁殖

한국어 (Korean)
n. - 번식, 증식, 보급

日本語 (Japanese)
n. - 繁殖, 普及, 宣伝, 伝達, 伝播

العربيه (Arabic)
‏(الاسم) نشر, بث, تكاثر, امتداد, انتشار‏

עברית (Hebrew)
n. - ‮הפצה, התפשטות‬

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