noun which may take the genitive case particle 'no', noun
new and old; incoming and outgoing
Used to contrast new and old things, or incoming and outgoing items (e.g., students, members, inventory). Often appears as a noun or with の to modify another noun.
新旧の技術を比較する。
Compare new and old technologies.
新旧の会員が集まった。
Both new and old members gathered.
新古 also means new and old, but is less common and often used in specific contexts like bookstores (新古書店). 新旧 is the standard term for general contrast.
Compound of 新 (new) and 旧 (old). The reading is the on'yomi of both characters.