discourse - definition and synonyms

verb 

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/dɪsˈkɔː(r)s/
present tense
I/you/we/theydiscourse
he/she/itdiscourses
present participlediscoursing
past tensediscoursed
past participlediscoursed

phrasal verb

discourse on/upon

[transitive]
present tense
I/you/we/theydiscourse on/upon
he/she/itdiscourses on/upon
present participlediscoursing on/upon
past tensediscoursed on/upon
past participlediscoursed on/upon
formal
to talk for a long time about a particular subject