Definitions of As:

• 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
• noun:   a United States territory on the eastern part of the island of Samoa
• adverb:   to the same degree (often followed by `as')

  Example: "Birds were singing and the child sang as sweetly"