There are 2 main definitions of Mt in English:

Mt1

Syllabification: Mt

abbreviation

1.1 (Mt.) (In place names) Mount: Mt. Everest

symbol

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The chemical element meitnerium.

Definition of Mt in:

There are 2 main definitions of Mt in English:

MT2

Syllabification: MT

abbreviation

1.2 (also m.t.) Metric ton.
1.4Modified tweet (a retweeted posting on the social media website Twitter in which the original content has been altered in some way).

Definition of Mt in: