What is the meaning of Tast?

Obsolete spelling of taste.

tasting, trying (of food, wine)

flavour, taste

a key (button on some electronic device)

imperative of taste

touch (tactile sense)

inflection of tasten:

1. first/second/third-person singular present indicative
2. imperative

first/second/third-person singular present indicative

imperative

until

until

a key (on a keyboard)

imperative of taste

a key (on a keyboard)

father-in-law

feel, touch

key

father-in-law (one's wife's father)

Source: wiktionary.org