observe [ ob·serve ]
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1. Notice or perceive (something) and register it as being significant.
Many cultures observe a significant event as a right of passage.
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2. Watch (someone or something) carefully and attentively.
In the meantime, they simply observe him and watch him grow.
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3. Take note of or detect (something) in the course of a scientific study.
No air leaks were observed during the study period.
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4. Make a remark.
These, as Curtis Blow once observed, are the breaks.
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5. Fulfil or comply with (a social, legal, ethical, or religious obligation)
Religious minorities observe their own rituals.
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6. Maintain (silence) in compliance with a rule or custom, or temporarily as a mark of respect.
a minute's silence will be observed
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7. Perform or take part in (a rite or ceremony)
This ceremony has been observed for the past eight years.
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8. Celebrate or acknowledge (an anniversary)
they observed the one-year anniversary of the flood
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Origin
1. Late Middle English (in observe (sense 3)): from Old French observer, from Latin observare ‘to watch’, from ob- ‘towards’ + servare ‘attend to, look at’.

