comenzó

third-person singular preterite indicative of comenzar

su

1. Apocopic form of suyo his, her, its, one's, their, your (formal)
2. Apocopic form of suyo his, her, its, one's, their, your (formal)
3. Apocopic form of suyo (“your”)

carrera

1. race
2. run (act of running)
3. run
4. course of study
5. career
6. run (line of knit stitches which have unravelled)
7. journey, fare (of a taxi)
8. path (of a moving object), trajectory
9. avenue generally in a north–south direction and vice versa, as opposed to a calle (east–west or vice versa)

profesional

• Adj

  professional

• Noun

en

1. in, at, on
2. in (a time)
3. in (a language)
4. used after some verbs and translated by various prepositions in English
5. in (in various expressions)

argentinos

• Adj

  masculine plural of argentino

• Noun