determiner

one

one [number,determiner] (NUMBER)

The number 1

US /wʌn/ 
UK /wʌn/ 
Example: 

You've got three bags and I've only got one.

third

third [ordinal number]
Example: 

The third of Mordad

coming after two other things in a series

Persian equivalent: 
Example: 

The third of Mordad

second

second [ordinal number, determiner]
US /ˈsek.ənd/ 
UK /ˈsek.ənd/ 
Example: 

She doesn't like her father's second wife. 

the second person, thing, event etc is the one that comes after the first

Persian equivalent: 
Example: 

She doesn't like her father's second wife. 

first

first [ordinal number, determiner]
US /ˈfɝːst/ 
UK /ˈfɜːst/ 
Example: 

I am the first child in the family. 

coming before all the other things or people in a series

Persian equivalent: 
Example: 

I am the first child in the family. 

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