There are 2 definitions of Tm in English:

Tm1

Syllabification: Tm

symbol

The chemical element thulium.

Definition of Tm in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of Tm in English:

TM2

Syllabification: TM

abbreviation

trademark
Transcendental Meditation.

Definition of Tm in: