decennium

C2+ Topic:Time

US /dɪˈsɛniəm/ UK /dɪˈseniəm/ See IPA manual

Meanings

1

noun
a period of ten years; a decade

Over the past decennium the city doubled in size.

Thesaurus

Synonyms

1 noun · a period of ten years; a... decade decennaryten years

Word family

Related forms decennial decennary decade

Etymology

From Latin decennium ('a period of ten years'), from decem ('ten') plus annus ('year'), with the connecting form -enn-.

decennium Latin decem Latin annus Latin

View etymology graph ->

Topics

Time

External links

# decennium

**Type:** Word
**Level:** C2+
**Part of speech:** noun
**IPA (US):** /dɪˈsɛniəm/
**IPA (UK):** /dɪˈseniəm/

## Meanings
1. a period of ten years; a decade

## Examples
- Over the past decennium the city doubled in size.

## Synonyms
- decade
- decennary
- ten years

## Related Forms
- decennial
- decennary
- decade

## Roots and Affixes
- Root: decennium
- Root: decem
- Root: annus

## Etymology
From Latin decennium ('a period of ten years'), from decem ('ten') plus annus ('year'), with the connecting form -enn-.

## AI Etymology
Decennium is from Latin decennium ('a period of ten years'), from decem ('ten') plus annus ('year'), with the connecting form -enn-. The ancestry passes through Latin decennium, Latin decem, and Latin annus. In present use as a noun, it means "a period of ten years; a decade", keeping the historical formation close to the word's ordinary semantic work. Related words include decennial, decennary, and decade. The surrounding word family keeps the same base visible in decennial, decennary, and decade, showing how the headword belongs to a larger cluster rather than standing alone.

## Topics
- Time

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