- because; since因为; 鉴于：
seeing that I'm awake, I might as well come with you.
既然我已经醒了, 我还是到你那里来。
mass noun
1- the action of seeing someone or something看见。
1.1
- Astronomy the quality of observed images as determined by atmospheric conditions【天文】（影响天象观测质量的）宁静度, 视宁度。
短语
seeing is believing
- proverb you need to see something before you can accept that it really exists or occurs.〈谚〉眼见为实。