Noun

(countable, uncountable) a division into smaller pieces of something that has already been divided; to separate something

Subdivide the sentence into pieces and understand it a bit at a time.

(countable) such a piece that has been divided

Work on one subdivision at a time.

(countable) a parcel of land that has been divided into lots

(countable) a group of houses created by the same builder or in the same general area

They're putting in a new subdivision out past Black Ranch Road.

Noun

(en noun)

An administrative division of an area.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=Foreword citation , passage=‘I understand that the district was considered a sort of sanctuary,’ the Chief was saying. ‘An Alsatia like the ancient one behind the Strand, or the Saffron Hill before the First World War. […]’}}

the Soho district of London

An area or region marked by some distinguishing feature.

the Lake District in Cumbria

(UK) An administrative division of a county without the status of a borough.

South Oxfordshire District Council