втори

In a sentence

• Аз съм на втори курс в университета.

  I am in my second year of university.

  Here, 'втори' describes the ordinal number 'second' related to the year of study in university.

• Вторият етаж на сградата е затворен за ремонт.

  The second floor of the building is closed for renovation.

  'втори' as 'вторият' is the masculine singular definite form of 'second,' referring to the specific second floor.

• Той беше втори на състезанието.

  He was second in the competition.

  Here, 'втори' indicates the ordinal number 'second,' referring to position in a competition.