illative particle
Definition - A conjunction — such as hence, therefore, and wherefore — that expresses an inference.

1. It is a conjunction not a particle, so why is it called a particle. If anyone knows, please contact me.

Example -
I shrink therefore I evanesce.

Etymology -
The term derives from the Latin illatio, which derives from illatus, the past participle of inferre, infer.

Oxford English Dictionary -
The phrase's first citation is from 1611:
"First reason … collected from the illative particle therefore."
(W. Sclater Key iii. 20. 328)

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