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one

subject fact

one indicates that that there must be exactly one instance linked to each object at the other end of the association in a UML diagram 2001-08-30 14:56:51.0
is a subtopic of 5.3 - Associations and Multiplicity
is a kind of multiplicity

multiplicity can be written as a specific positive integer or as several multiplicity values or ranges separated by commas 2001-08-30 14:56:39.0
is drawn as a range separated by two dots (e.g. 2..3) in a UML class diagram
should be as least restrictive as possible so as not to reduce the flexibility of the system

one	indicates that that there must be exactly one instance linked to each object at the other end of the association in a UML diagram
	is a subtopic of 5.3 - Associations and Multiplicity
	is a kind of multiplicity
multiplicity	can be written as a specific positive integer or as several multiplicity values or ranges separated by commas
	is drawn as a range separated by two dots (e.g. 2..3) in a UML class diagram
	should be as least restrictive as possible so as not to reduce the flexibility of the system