Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: conscius, from com- ( COM-) + scire 'to know'

conscious

 adjective
     
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con‧scious S2 W3
1

aware

[not before noun] noticing or realizing something [= aware]
conscious of (doing) something
I became conscious of someone watching me.
I was very conscious of the fact that I had to make a good impression.
conscious that
She was conscious that Marie was listening to every word.
2

awake

M awake and able to understand what is happening around you [≠ unconscious]:
The driver was still conscious when the ambulance arrived.
3

conscious effort/decision/attempt etc

an effort etc that is deliberate and intended:
Vivien had made a conscious effort to be friendly.
4

concerned

thinking a lot about or concerned about something
politically/environmentally/socially etc conscious
environmentally conscious consumers
health-conscious/fashion-conscious etc
Many employers are becoming more safety-conscious.
conscious of
She was very conscious of security.
➔ self-conscious
5

thoughts

conscious thoughts, memories etc are ones which you know about [↪ subconscious]:
the conscious mind
Without conscious thought, she instinctively placed a hand on his arm.
It affects the audience at a deeper, less conscious level.
—consciously adverb:
She was probably not consciously aware of her true feelings.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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