Consciousness
Awareness
noun, verbal noun
Your ideas while discerning things show your consciousness and an awareness of your surroundings. You not only know that you have ideas, but you think about them and discern them.
意識 is often used in relation to whether someone has consciousness or not, like in medical contexts or news stories. In other contexts it can refer to being aware of certain things, like a high awareness of environmental issues.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
彼女は意識を失った。
She lost consciousness.
その方は、意識はありますか？ありませんか？
Is the person conscious, or unconscious?
ブロッコリーは体に良いと読んだので、意識して食べるようにしています。
I read that broccoli is good for you, so I make a conscious effort to eat it.
彼っていつも勉強してるし、かなり意識が高いよね。
He's always studying and is quite aware, isn't he?