> もう学校始まってから二週間もたってるよ

Please verify because I've seen in some dictionaries it's already an obsolete
word, it means mota-"having done"

Some dictionaries don't have a word mota so I can't see the conjugations on
this one.
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2016-01-06T14:54:00.697
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question
translation words parsing
What does "motatte" mean?
「たって」 is from the verb 経つ{たつ}, meaning "to pass (time)". It's usually not
written in kanji.

も is a particle attached to 二週間, and when attached to a counter it means the
speaker believes that that amount is a lot.

> もう学校始まってから二週間も経ってるよ  
>  It's already been two weeks since school started!
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2016-01-06T14:59:10.280
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answer
You are parsing it incorrectly: 二週間もたってる is 二週間も + たって（い）る.

  * も is sense 一・④ in 大辞林 

> **も**  
>  **一** (係助)  
>  [...]  
>  ④ 極端な物事を指定し、強調する。…さえも。「聞いたこと–ない話」「太っ腹の社長–、今度はまいったようだ」

and is for emphasis.

  * たって is the te-form of 経つ (as in 時間がたつ "time passes")
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2016-01-06T15:09:24.460
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answer