(music) A musical key based upon a minor scale. / (idiomatic) A mood of melancholy or pathos.

(idiomatic) In a restrained manner; on a small or limited scale.

(computing) Software or hardware designed to record keyboard entries, often for the purpose of stealing passwords or other sensitive data.

An item carried on a key ring either as decoration or security.

One of the two keys used in asymmetric cryptography, which is published to others, unlike the private key.

A key designed to open a set of several locks; a passkey. / (figuratively) Any tool or technique that can solve many types of difficulty.

(UK) A hex head wrench.

(Canada, US, colloquial) Kind of. / (slang) In a low-key or surreptitious manner; secretively; on the down-low.

(art, photography) Dark; characterised by dark tones and muted colours. / (by extension) Restrained, subtle, not trying to attract attention.

A hex head wrench.