(derogatory) A dunce, mentally dull or stupid person. / (derogatory) A person who refuses to learn or grow mentally.

(physics, chemistry) The total number of protons and neutrons in an atomic nucleus. Symbol: A

A gentle push. / (Internet) A feature of instant messaging software used to get the attention of another user, as by shaking the conversation window or playing a sound.

(transitive) To push against gently, especially in order to gain attention or give a signal. / (transitive) To near or come close to something. / (transitive) To move slightly.

The Book of Numbers, the fourth of the Books of Moses in the Old Testament of the Bible, the fourth book in the Torah.

(countable) A small, compact chunk or clump. / (countable) A chicken nugget. / (countable) A tidbit of something valuable. / (countable) A small piece of tasty food, a tidbit.

(physics) The combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy; the process that makes the sun shine, and hydrogen bomb explode.

A short poem or song for children, mostly anonymous or handed down by folklore

A telephone number not listed in the directory.

A woman hired to suckle another woman's child. / (figuratively, by extension) Someone who treats someone else with excessive care.