moreover

1. Origins, structure, and basic meaning

• Structure: 且 has five strokes; the connective 且つ is read かつ.
• Basic usage: 且つ indicates that two qualities or conditions both hold.
  • 軽く、且つ丈夫だ means light and also sturdy.

2. Common pitfalls and similar expressions

• Both, not either
  • Two conditions joined by 且つ must both be satisfied.
  • Replacing it with the alternative または changes the range of acceptable cases.
• Combined qualities and time order
  • Being light and sturdy describes two qualities together.
  • 且つ itself does not mean that one event happens after another.
• Connecting complete expressions
  • 研究者であり、且つ教育者でもある means to be both a researcher and an educator.
  • The surrounding predicates also need appropriate connecting forms; inserting the connective alone is not enough.