Ordinal Tens

coming or happening right after the nineteenth person or thing

The twentieth of December marks the beginning of winter in the Northern Hemisphere.

coming or happening right after the twenty-ninth person or thing

The thirtieth of June marks the end of the fiscal year for many companies.

position 40 in a countable series of things

coming or happening right after the forty-ninth person or thing

She celebrated her fiftieth birthday with a big party.

one part in sixty equal parts

position 70 in a countable series of things

position 80 in a countable series of things

position 90 in a countable series of things