This is the 105th most frequent Spanish word.
aún
"Still" or "yet," depending on context.
Here, 'aún' is used as a synonym of 'todavía' meaning 'yet' to indicate an action that has not been completed as of the time of speaking.
Aún no he terminado mi tarea.
I have not yet finished my homework.
Here, 'aún' means 'even', denoting an increase in degree or intensity for 'más cerca' (closer).
El regalo está aún más cerca de lo que pensabas.
The gift is even closer than you thought.
In this context, 'aún' is used in the phrase 'aún así' which is equivalent to 'even so', indicating concession or persistence despite a situation.