既存

1. Origins, structure, and basic meaning

• Structure: Here, 既存 is read きそん and means already existing.
• Basic usage: Use it for equipment or systems already in place, often in contrast with a new plan.

2. Common pitfalls and similar expressions

• Before a noun
  • 既存の設備 means existing equipment.
  • 既存の制度 means an existing system. Both link nouns with の.
• Existence is not obsolescence
  • In contrast with 新規, it emphasizes that something already exists. 既存 alone does not evaluate it as worn out or useless.