名詞 discourse:

1. extended verbal expression in speech or writing
2. an address of a religious nature (usually delivered during a church service)
   同義詞：sermon, preaching
3. an extended communication (often interactive) dealing with some particular topic
   同義詞：discussion, treatment

動詞 discourse:

1. to consider or examine in speech or writing
   同義詞：talk about, discuss
2. carry on a conversation
   同義詞：converse
3. talk at length and formally about a topic
   同義詞：hold forth, dissertate

1. Sweet discourse makes short days and nights.
   [諺]話若投機嫌日短。
2. He discoursed impressively on Newton's theory of gravity.
   他講述了牛頓的引力定律，給人以深刻的印象。
3. They listened to his discourse on human relations.
   他們聽他作關(guān)于人際關(guān)系的演講。
4. The judges had solemn discourse together.
   法官們在一起嚴肅地交談。

dis.course

n.（名詞）
Verbal expression in speech or writing.
演說，論述：口頭表達或書面文字表達
Verbal exchange; conversation.
交談；對話
A formal, lengthy discussion of a subject, either written or spoken.
正式的討論：對某一題目的正式、長時間的書面或口頭討論
Archaic The process or power of reasoning.
【古語】 推理能力：推理過程或能力
v.（動詞）
dis.coursed,dis.cours.ing,dis.cours.es[d-skôrs., -skôrs.]
v.intr.（不及物動詞）
To speak or write formally and at length.See Synonyms at speak
演說：正式而長久地講述或書寫參見 speak
To engage in conversation or discussion; converse.
談?wù)?，談話：進行談話或談?wù)摚唤徽?/br>v.tr.Archaic （及物動詞）【古語】
To narrate or discuss.
敘述，討論

來源：
Middle English discours [process of reasoning]
中古英語 discours [推理過程]
from Medieval Latin discursus
源自 中世紀拉丁語 discursus
from Latin [a running about] [from past participle of] discurrere [to run about]
源自 拉丁語 [東奔西跑；奔忙] [] 源自discurrere的過去分詞 [東奔西跑；奔忙]
dis- [apart] * see dis-
dis- [分開，離開] *參見 dis-
currere [to run] * see kers-
currere [跑] *參見 kers-

【引伸】
discours.er
n.（名詞）