Public:

1a: exposed to general view : OPEN

b: WELL-KNOWN, PROMINENT

c: PERCEPTIBLE, MATERIAL

Discourse:

1: verbal interchange of ideas

especially : CONVERSATION

2a: formal and orderly and usually extended expression of thought on a subject

b: connected speech or writing

c: a linguistic unit (such as a conversation or a story) larger than a sentence

3: a mode of organizing knowledge, ideas, or experience that is rooted in language and its concrete contexts (such as history or institutions)