## Meanings
1. To watch someone or something carefully.
2. To notice or see something.
3. To make a remark or comment about something.
4. To obey or follow a rule, custom, or law.
5. To celebrate or mark a special day or holiday.

## Examples
- The students observed the experiment closely.
- I observed a change in his behaviour over the week.
- He observed that the weather had been unusually warm.
- All drivers must observe the speed limit.
- Many families observe Christmas with a big meal.

## Derived Forms
- observance
- observant
- observation
- observational
- observatory
- observer

## Roots and Affixes
- Root: *ser- (guard)
- Root: observer
- Root: observō
- Root: *ser-

## Etymology
From Middle French observer, from Old French observer, from Latin observō (“to watch”), from ob- (“before”) + servō (“to keep”), from Proto-Indo-European *ser- (“to guard”). Cognate with Gothic 𐍃𐌰𐍂𐍅𐌰 (sarwa, “weapons, armour”), Old English searu (“device”).

## AI Etymology
Observe comes from Middle French observer, from Old French observer, from Latin observō (“to watch”), from ob- (“before”) + servō (“to keep”), from Proto-Indo-European *ser- (“to guard”). Cognate with Gothic 𐍃𐌰𐍂𐍅𐌰 (sarwa, “weapons, armour”), Old English searu (“device”). The historical chain includes Proto-Indo-European *ser- (guard), Middle French observer, Old French observer, Latin observō, and Proto-Indo-European *ser-. Modern senses include to watch someone or something carefully and to notice or see something. The wider word family includes derivatives such as observance, observant, observation, observational, observatory, and observer.

## Topics
- Senses & Perception
- Science & Research

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