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Therein

adverb

/ˌðɛərˈɪn/

Meaning

in that place; in that respect

The box contains many treasures, and therein lies its value.

inside, within, in that

outside, beyond, without

therein lies, therein contained, therein described

on or to a lower floor of a building

sometimes; from time to time; not regularly

in comparison to something else; quite; fairly

Slowly and steadily, taking place step by step.

during the time between two events; in the period of time between now and when something else happen...

without doubt; certainly; clearly