[Elamur Dictionary](https://md.dictionary.elamur.ai/free/en/) · [this page in HTML](https://dictionary.elamur.ai/free/en/english/delta/)

[dictionaries](https://md.dictionary.elamur.ai/free/en/) / [English](https://md.dictionary.elamur.ai/free/en/english/) / [D](https://md.dictionary.elamur.ai/free/en/english/d/) / delta

# delta

noun (a delta, deltas)

«delta» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A flat, often triangle-shaped area of land where a river splits into many smaller streams before it flows into the sea, made from mud and sand the river carries. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m1)
2. The fourth letter of the Greek alphabet, Δ or δ. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m2)
3. In maths and science, Δ can stand for a change in an amount. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#m3)

### In the lessons

In geography, deltas form at the mouths of rivers like the Nile and the Mississippi; the soil is rich for farming but floods easily. In maths and science, Δ means «change in». Phrases: «river delta», «the Nile Delta».

### Examples

- The Nile Delta is shaped like a triangle. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x1)
- The river drops its mud and sand to build a delta. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x2)
- Many birds live in the wetlands of the delta. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x3)
- Farmers grow rice on the delta because the soil is rich. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x4)
- The Greek letter delta looks like a triangle: Δ. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x5)
- Floods are common on a low, flat delta. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/#x6)

### Note

Countable: deltas. Named after the Greek letter Δ because many deltas are triangle-shaped. Not every river has a delta; strong waves or tides can wash the mud away.

## On Mova

- [Trees and pragmatics of «delta» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/delta/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«delta» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/delta.html) on Mova free.