Used as an expletive subject of be in its sense of “exist”, with the semantic, usually indefinite subject being postponed or (occasionally) implied.

(humorous) Used to encourage someone to attend an event.

plural of theremin

(formal) By it; by that; by that means, or as a consequence of that.

(takes a reflexive pronoun) in that; in that place; in him/her/it.

After that, from then on; thenceforth.

in the following part (of a document or speech)

before that time; beforehand

There; at that place. / At that event.

Of this, that, or it. / From that circumstance or origin; therefrom, thence.