係争

1. Origins, structure, and basic meaning

• Structure: 係争 (けいそう) is an action and state noun for an unresolved legal dispute over rights or ownership.
• Basic usage: 係争中の土地 modifies property under active dispute, while 商標をめぐる係争は長期化する says a trademark conflict may continue for a long time.

2. Common pitfalls and similar expressions

• Pending dispute and possible duration
  • 係争中 denotes an unresolved proceeding, whereas 係争は長期化する可能性 concerns future duration. Not every disagreement is a legal dispute.