Definitions:
a small piece of shaped metal with incisions cut to fit the wards of a particular lock, which is inserted into a lock and turned to open or close it

each of several buttons on a panel for operating a computer, typewriter, or telephone

a thing that provides a means of achieving or understanding something

a group of notes based on a particular note and comprising a scale, regarded as forming the tonal basis of a piece of music

the dry winged fruit of an ash, maple, or sycamore, typically growing in bunches; a samara.

the part of a first coat of wall plaster that passes between the laths and so secures the rest.

the keyhole-shaped area marked on the court near each basket

of crucial importance

enter or operate on (data) by means of a computer keyboard or telephone keypad

fasten (something) in position with a pin, wedge, or bolt

roughen (a surface) to help the adhesion of plaster or other material

word (an advertisement in a periodical), typically by varying the form of the address given, so as to identify the publication generating particular responses

vandalize (a car) by scraping its paint with a key.

be the crucial factor in achieving

a low-lying island or reef, especially in the caribbean