Definition of "As" :

noun: a United States territory on the eastern part of the island of Samoa

noun: a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar

adverb: to the same degree (often followed by as')

"Birds were singing and the child sang as sweetly."