Merriam-Webster's Collegiate® Dictionary, 11th Edition
SMILE
I. verb (smiled; smiling)
Etymology: Middle English; akin to Old English smerian to laugh, Sanskrit smayate he smiles
Date: 14th century
intransitive verb to have, produce, or exhibit a smile,
2. to look or regard with amusement or ridicule , to bestow approval , to appear pleasant or agreeable, transitive verb to affect with or by smiling, to express by a smile, smiler noun smilingly adverb
II. noun
Date: 15th century
a facial expression in which the eyes brighten and the corners of the mouth curve slightly upward and which expresses especially amusement, pleasure, approval, or sometimes scorn, a pleasant or encouraging appearance, smileless adjective