(uncountable) language, jargon, or terminology used uniquely in a particular environment or group.

(countable) Speech, conversation. (Can we add an example for this sense?)

(countable, informal) Short for speaker point.

(dated) a low class bar, a speakeasy.

(intransitive) To communicate with one's voice, to say words out loud.

(intransitive, reciprocal) To have a conversation.

(by extension) To communicate or converse by some means other than orally, such as writing or facial expressions.

(intransitive) To deliver a message to a group; to deliver a speech.

Be able to communicate in a language or in the manner of specialists in a field.

(transitive) To utter.

(transitive) To communicate (some fact or feeling); to bespeak, to indicate.

(informal, transitive, sometimes humorous) To understand (as though it were a language).

(intransitive) To produce a sound; to sound.

Of a bird, to be able to vocally reproduce words or phrases from a human language.

(transitive, archaic) To address; to accost; to speak to.