## Meanings
1. A flat, straight strip of wood, plastic, or metal marked with units, used for measuring or drawing straight lines.
2. A person who has official power over a country or its people.

## Examples
- She used a ruler to draw a straight line across the page.
- He became the ruler of a vast empire.

## Synonyms
- overling
- provost

## Derived Forms
- co-ruler
- coruler
- overruler
- planet-ruler
- ruleress
- rulerless
- rulership
- subruler

## Related Forms
- boss
- caliph
- eminence
- excellency
- generalissimo
- grace
- highness
- leader
- lordship
- magistrate
- magnate
- majesty

## Roots and Affixes
- Root: reuler

## Etymology
From Middle English reuler; equivalent to rule + -er.

## AI Etymology
Ruler comes from Middle English reuler; equivalent to rule + -er. Modern senses include a flat, straight strip of wood, plastic, or metal marked with units, used for measuring or drawing straight lines. and a person who has official power over a country or its people.. The wider word family includes derivatives such as co-ruler, coruler, overruler, planet-ruler, ruleress, and rulerless and related forms such as boss, caliph, eminence, and excellency.

## Topics
- People & Society
- Materials & Substances

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