This is the 262nd most frequent Chinese word.
意识
"Awareness" or "consciousness."
意识 here means "to realize or become aware of."
他开始意识到健康的重要性。
He began to realize the importance of health.
意识 in this case refers to "awareness or consciousness."
在环保问题上，我们需要增强意识。
In environmental protection issues, we need to enhance awareness.
意识 in this usage forms part of a term to express the concept of "subconscious mind."