For Harden Off (Hardening) we have a term and definition in Botanical.

Harden Off (Hardening) (Botanical)

The straightforward process of gradually acclimating a tender seedling, germinated and nurtured under artificial conditions, for life in the wilds of the garden. For most tender plants (tomatoes, peppers, etc.), hardening off for two weeks is desirable.
Examine your garden on a frosty morning searching for areas that are relatively free from frost. For the first week, place your plants outside during the warmest part of the day. Initially limit their exposure, bringing them back indoors and under cover, after a few hours.
During the second week, gradually extend the amount of time you leave them outside, bringing them back in during the evening. By the end of the second week, assuming that there is no longer any threat of frost, your plants should be ready for transplanting into the garden.

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