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A calculation definition is a kind of action definition ... that has a distinguished parameter with direction out called the result parameter (which is usually the only out parameter).

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30. Calculations: Calculation Definitions.sysml
SysMLv2: Cameo: Although you can use return in SysMLv2 code for the out parameter of a calculation it will display as an out in the parameters compartment. Note that the special parameter is called 'result' but the code keyword is return and it's an out.
SysMLv2: Cameo: The special result parameter of a calculation (which is an out parameter) won't display as a parameter symbol on its owner's symbol boundary but you can still list it in the parameters compartment (it will appear as an out)
30. Calculations: Calculation Usages-1.sysml
30. Calculations: Calculation Usages-2.sysml
SysMLv2: TIP: Cameo won't display the out result (code keyword return) as a boundary "pin" symbol but you can list it in the parameters compartment as an out parameter (possibly inherited).
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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A calculation definition is a kind of action definition ... that has a distinguished parameter with direction out called the result parameter (which is usually the only out parameter).
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A calculation definition specifies a reusable computation that returns a result in the result parameter.
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A calculation usage is an action usage that is a usage of a calculation definition.
In addition, the result parameter for a calculation definition or usage can be declared as an out parameter using the keyword return instead of out. Note that a calculation definition or usage always has a result parameter, inherited if not owned.
checkFeatureResultRedefinition: If a Feature is a result parameter of an owningType that is a Function or Expression, then, for each direct supertype of its owningType that is also a Function or Expression, it must redefine the result parameter
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