(verb)
broadly, to lightly or gently touch something;
e.g. She felt the cool breeze kiss her skin when she opened the window.
(noun)
the action or instance of lightly touching someone/something with one's lips;
e.g. My mother placed a kiss on my forehead before sending me to school.
(noun)
an expression of love or affection in written communication such as a letter, often in the form of the letter "X" (usually used in the plural as "kisses");
e.g. His letter ended with kisses and good wishes for us.
(noun)
the action or instance of lightly or gently coming into contact with (i.e. touching) something or someone;
e.g. The kiss of the pen left an ink stain on his white shirt.
(noun)
(American) a small drop-shaped cookie, or a small piece of chocolate candy;
e.g. She ate a chocolate kiss after dinner.