What does "as" mean?

See a translation

adverb

1.

used in comparisons to refer to the extent or degree of something.

"go as fast as you can"

conjunction

1.

used to indicate that something happens during the time when something else is taking place.

"Frank watched him as he ambled through the crowd"

synonyms:while, just as, even as, at the (same) time that, at the moment that, during the time that, just when;

simultaneously

"she caught a glimpse of him as he disappeared"

2.

used to indicate by comparison the way that something happens or is done.

"they can do as they wish"

synonyms:in the (same) way that, the (same) way, in the (same) manner that; 

informallike

"there were some who felt as Frank did"

preposition

1.

used to refer to the function or character that someone or something has.

"it came as a shock"

synonyms:in the guise of, with the appearance of, in the character of, so as to appear to be More

2.

during the time of being (the thing specified).

"he had often been ill as a child"