且つ

1. Origins, structure, and basic meaning

• Structure: 且つ is read as かつ and is a formal connective showing that two qualities, roles, or conditions both hold.
• Basic usage: Use 軽く、且つ丈夫 to join qualities and 研究者であり、且つ教育者でもある to combine two roles.

2. Common pitfalls and similar expressions

• Both statements remain valid
  • A desk can be both light and sturdy; the connective adds the second property without choosing between them.
• Formal register and spelling
  • It is more formal and written in tone than a conversational connector, and it may also appear as かつ.