Over time, this word underwent a figurative extension of meaning and came to have a new meaning.

She was reading a book under the peach tree.

He has a deep interest in toponymy.

He is interested in toponymy.

I will hold my birthday party on the twenty-seventh day of the month.

The thirteenth day is my birthday.

They launched a surface-to-air missile.

He is always a ragequitter in games.

We celebrate our wedding anniversary on the twenty-sixth day of the month.

The thirty-first day is my birthday.