Word used to describe the act of dominating a conversation?

Someone dominates a conversation by not letting others get a word in. I'm thinking its a combination of snow job and fillibuster (though not political in nature).

EDIT: to clarify, Not quite a long tedious speech; Speaker prompts a response but doesnt actually allow the response to be heard because the speaker begins talking again as if the response was heard.

I would say "He monopolised the conversation"

or "Insisted on taking centre stage the whole time"

I have also heard family members say "He was holding court" - which I think is a commonly used sarcastic reference to the way a Judge commands the attention of everyone in court .

Monologue is a good general descriptor:

1.1 A long, tedious speech by one person during a conversation:

ODO

Depending on the content of the domination, lecture might work better

2 A long serious speech, especially one given as a scolding or reprimand:

ODO

Harangue would fit if the speaker exhibited an aggressive or critical demeanor:

noun

A lengthy and aggressive speech:

The idiom hold forth implies talking for a long time about a subject that interests the speaker but not necessarily the audience.

Hold forth: to talk at great length; harangue

When we left, he was still holding forth on World War II.

(Dictionary.com)

I first came across this phrase in Stephen King's novel The Tommyknockers, where it's used to describe a character drunkenly ranting about nuclear power long after everyone else at the party wished he'd stop.