се: three
I will work for three hours.
Ин деҳа аз роҳи мошингард се километер болотар ҷойгир аст.
This village is located three kilometres up from the road.
Bonus:
Definition from Tajik dictionary
се: шумораи миқдорӣ, ки баробари ду ҷамъи як (2+1) аст.
(cardinal number that is equal to two plus one)
сеюм: third (ordinal number)
сесад: three hundred (one word)
се ҳазор: three thousand
сеяк: one third (fraction)
се as a prefix –
себора: three times
секунҷа: triangle
сеошёна: three-storey
серанга: three-coloured
серӯза: three-day
семоҳа: three-month
сесола: three-year
When combining a number with a noun, no plural ending is added. Examples:
ду кас: two people
чор пишак: four cats