This is the 249th most frequent Spanish word.
afirmó
"He/she/it affirmed" or "stated."
Here 'afirmó' is used as in 'declared' or 'stated' something as a fact, giving validity to it.
El profesor afirmó que los estudiantes hicieron un buen trabajo.
The teacher affirmed that the students did a good job.
In this context, 'afirmó' is used to specify an assertion of an observation or claim.
La testigo afirmó haber visto al acusado en el lugar del crimen.
The witness claimed to have seen the defendant at the crime scene.
Here 'afirmó' demonstrates the act of confirming or endorsing a promise or intention.