Definition

The number that comes after twenty-nine and before thirty-one, often used to refer to the age range from 30 to 39 or the decade of life between those ages.

Example

She celebrated her thirtieth birthday with a big party.

Conversation

Have you thought about what it will be like when we hit our thirties?

I know, right? It feels like we just graduated yesterday.

I hope it's as fun as our twenties, but with a bit more stability.

Definitely! I guess we’ll see how it goes in our thirties.

Synonyms & Antonyms

Root Explanation

Thirty → The word 'thirty' originates from Old English 'þritig', which is derived from the Proto-Germanic '*þrīz' (meaning three) combined with the suffix '-tig' (meaning a group of ten). Thus, 'thirty' literally means three groups of ten.

Memory Tip

Think of 'three' ('þrīz') and 'ten' ('tig') to remember that 'thirty' is three groups of ten.

Visually Confused Words