You might have more than one concept describing the same idea in Congree TermTiger. In that case, Congree TermTiger offers a feature to merge those concepts.
Select between two and five terms and click 
Merge.
You cannot merge more than five concepts in one operation. If you have more than 5 terms selected, you will get this message:
You cannot merge terms of the same concept. If you selected several terms of the same concept, it will only appear in merge view once.
Select the concept you would like to keep after merging here
All other concepts will be deleted after the successful merge
Select which fields to keep on concept level
Different concepts might have different content in the same fields. For example could two concepts have different definitions already. Since only one Definition is allowed, you have to decide which definition to keep 
and which one to delete 
.
You can only merge, when you decided for each duplicate field which one you want to keep.
You can see for which fields your decision is pending by the info icon in front of the field.
Select which terms to keep on term level
You can decide for each term whether you want to keep it after the merge. Pressto keep it and to delete it.
Press merge to finalize the merge
The merge will be executed when you click “Merge”.
Press cancel to cancel the merge
The merge will be cancelled and no data will be moved or deleted when you click “Cancel”.