1. A topic, issue, or subject that is easy to understand or unambiguous
The contract terms were a clear matter of negotiation between both parties.
Os termos do contrato foram um assunto claro de negociação entre ambas as partes.
2. Something transparent or pellucid in nature or appearance
The clear matter of the crystal allowed light to pass through beautifully.
A matéria clara do cristal permitiu que a luz passasse através dele lindamente.