## Meanings
1. Simple and ordinary, without decoration or anything added.
2. Easy to see or understand; obvious.
3. Honest and direct, without trying to soften the truth.
4. A large area of flat, open land.

## Examples
- He was dressed simply in plain black clothes.
- It was plain that something was wrong.
- She told me the plain truth about what had happened.
- They emerged from the woods onto a vast open plain.

## Derived Forms
- etchplain
- floodplain
- overplain
- palaeoplain
- paleoplain
- peneplain
- plain-clothed
- plain-clothes
- plain-dealing
- plain-hearted
- plain-laid
- plain-looking

## Related Forms
- complain
- esplanade
- explain
- plaint
- plaintive

## Roots and Affixes
- Root: *pleh₁-
- Root: pleyn
- Root: plein
- Root: plēnus
- Root: *plēnos
- Root: *pl̥h₁nós

## Etymology
From Middle English pleyn, borrowed from Old French plein, from Latin plēnus (“full, filled, complete”). Ultimately from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Doublet of plene, plenary, and full.

## AI Etymology
Plain comes from Middle English pleyn, borrowed from Old French plein, from Latin plēnus (“full, filled, complete”). Ultimately from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Doublet of plene, plenary, and full. In present-day English it covers simple and ordinary, without decoration or anything added, easy to see or understand; obvious, and honest and direct, without trying to soften the truth. The wider family includes derived forms such as etchplain, floodplain, overplain, palaeoplain, paleoplain and related forms such as complain, esplanade, explain, plaint.

## Topics
- Describing Qualities

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