All tokens offered on the incoming edges of a MergeNode are offered to the outgoing edge. There is no synchronization of flows or joining of tokens.

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OR with DecisionNode and MergeNode
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Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
CONSTRAINT
UML keywords
Activity
Activity Diagram
ControlNode
MergeNode
ActivityNode::outgoing
ActivityNode::incoming
token
control token
object token
Full quote
All tokens offered on the incoming edges of a MergeNode are offered to the outgoing edge. There is no synchronization of flows or joining of tokens.
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A MergeNode is a control node that brings together multiple flows without synchronization.
A MergeNode shall have exactly one outgoing ActivityEdge but may have multiple incoming ActivityEdges.
If the outgoing edge of a MergeNode is a ControlFlow, then all incoming edges must be ControlFlows, and, if the outgoing edge is an ObjectFlow, then all incoming edges must be ObjectFlows.
A DecisionNode is a ControlNode that chooses between outgoing ActivityEdges for the routing of tokens.
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