Noun

(uncountable) Oneness; the state or fact of being one undivided entity.

* 1846 ,

If any literary work is too long to be read at one sitting, we must be content to dispense with the immensely important effect derivable from unity of impression - for, if two sittings be required, the affairs of the world interfere, and everything like totality is at once destroyed.

* {{quote-news

, year=2011 , date=October 1 , author=Saj Chowdhury , title=Wolverhampton 1 - 2 Newcastle , work=BBC Sport citation , page= , passage=Alan Pardew's current squad has been put together with a relatively low budget but the resolve and unity within the team is priceless.}}

A single undivided thing, seen as complete in itself.

* 1999 , Joyce Crick, translating Sigmund Freud, The Interpretation of Dreams , Oxford 2008, p. 137:

If a single day has brought us two or more experiences suitable to initiate a dream, the dream will unite references to them both into a single whole; it obeys a compulsion to form a unity out of them .

(drama) Any of the three classical rules of drama (unity of action, unity of place, and unity of time).`

(mathematics) Any element of a set or field that behaves under a given operation as the number 1 behaves under multiplication.

(legal) The peculiar characteristics of an estate held by several in joint tenancy.

Noun

The merging of similar or different elements into a union.

(physics) A nuclear reaction in which nuclei combine to form more massive nuclei with the concomitant release of energy.

(music) a style of music that blends disparate genres; especially types of jazz.

A style of cooking that combines ingredients and techniques from different countries or cultures

The act of melting or liquefying something by heating it.

* {{quote-book, 1855, James David Forbes, chapter=On Glaciers In General, year_published=1859, Occasional Papers on the Theory of Glaciers citation

, passage=From a vault in the green-blue ice, more or less perfectly formed each summer, the torrent issues, which represents the natural drainage of the valley, derived partly from land-springs, partly from fusion of the ice.}}

* {{quote-us-patent, 1951, Peter L. Paull & Frederick Burton Sellers, Method of Reducing Metal Oxides, 2740706 citation

, passage=The upper limit of temperature is determined by the point at which fusion of the ore takes place, or often, for practical purposes, the temperature at which the ore softens and agglomerates.}}

* {{quote-book, 2002, Philippe Rousset, chapter=Modeling Crystallization Kinetics of Triacylglycerols, Physical Properties of Lipids, editors=Alejandro G. Marangoni & Suresh Narine, isbn=0824700058 citation

, passage=Below the temperature of fusion of the solid phase, the growth rate of the solid/ liquid interface at low undercooling is affected mainly by undercooling.}}

(lb) The result of the hybridation of two genes which originally coded for separate proteins.

(lb) The process by which two distinct lipid bilayers merge their hydrophobic core, resulting in one interconnected structure.