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# cd

abbreviation (CD, CDs; cd)

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

## Everyday

1. A CD (compact disc) is a thin, shiny, round plastic disc that stores music or computer data, read by a laser. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#m1)
2. (computing) «cd» is a command for «change directory»: it moves you to another folder in a terminal. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#m2)
3. (science) «cd» is the symbol for the candela, the unit of light brightness. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#m3)
4. Other meanings in context: CD can mean «certificate of deposit» (money) or «corps diplomatique» (diplomat's car sign). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#m4)

### In the lessons

In everyday life CDs were used for music and games before streaming; many families still have them. In computing and coding lessons, «cd» is one of the first terminal commands. In history of technology, the CD followed records and cassettes. Phrases: «burn a CD», «CD player».

### Examples

- Grandad still listens to music on CDs. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x1)
- Put the CD in the player and press play. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x2)
- The CD was scratched, so it kept skipping. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x3)
- Type «cd Documents» to go into the Documents folder. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x4)
- Our class made a CD of our songs. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x5)
- A CD is read by a laser beam. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cd/#x6)

### Note

Usually capitals: CD; plural CDs (no apostrophe). Say each letter: «see-dee». In computing it is small letters: cd. «Disc» with a c is used for CDs and DVDs.

## On Mova

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