つまり details

Examples

in other words; so what it comes to is — restates what was just said more plainly or more sharply

「明日あしたも明後日あさってもバイトなんだ。」「つまり、週末しゅうまつは無理むりってこと？」

"ashita mo asatte mo baito na n da." "tsumari, shuumatsu wa muri tte koto?"

"I've got shifts tomorrow and the day after." "So in other words, the weekend's out?" casual

会場かいじょうは駅えきの裏側うらがわにあります。つまり、北口きたぐちから出でたほうが近ちかいということです。

kaijou wa eki no uragawa ni arimasu. tsumari, kitaguchi kara deta hou ga chikai to iu koto desu.

The venue is on the far side of the station. In other words, it's closer if you go out the north exit. neutral

今期こんきの受注じゅちゅうは前年ぜんねんの半分はんぶんにとどまっております。つまり、来期らいきの計画けいかくは一いちから見直みなおす必要ひつようがあるということでございます。

konki no juchuu wa zennen no hanbun ni todomatte orimasu. tsumari, raiki no keikaku wa ichi kara minaosu hitsuyou ga aru to iu koto de gozaimasu.

Orders this term have come to only half of last year's. In other words, next term's plan has to be rebuilt from scratch. formal

ということは
ということは flags the second half openly as something the speaker has worked out (返事へんじがない。ということは、もう出でたんだろう); つまり presents it as merely the first half in plainer words, even where it is in fact an inference — the same step, claimed as a paraphrase rather than as a deduction.
わけだ
わけだ closes the sentence and marks the conclusion as one that finally makes sense of the facts (道理どうりで寒さむいわけだ); つまり opens the sentence and merely restates, carrying none of that "so that's why" click.
というより
というより rejects the wording just used and substitutes a better one (寒さむいというより痛いたい); つまり keeps the previous wording as correct and adds a plainer version of it — so というより corrects and つまり translates.
というか
つまり restates the point in sharper terms and claims both versions come to the same thing; というか withdraws the first version instead, so what follows corrects it rather than clarifying it — and つまり opens a sentence where というか closes a phrase.