| Date: | 1100-1200 |
| Language: | Old French |
| Origin: | tresor, from Latin thesaurus, from Greek thesauros |
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trea‧sure1

1 [uncountable] a group of valuable things such as gold, silver, jewels etc
2 [countable] a very valuable and important object such as a painting or ancient document :
The Book of Kells is Trinity College's greatest treasure.
The Book of Kells is Trinity College's greatest treasure.3 [singular] informal someone who is very useful or important to you :
Our housekeeper is a real treasure.
Our housekeeper is a real treasure.