Hi.
What does practice mean in:
Thanks in advance
In the third sentence it is a verb; in the other sentences it is a noun. com/definition/us/practice : 1. The actual application or use of an idea, belief, or method, as opposed to theories relating to it.
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In the third sentence it is a verb; in the other sentences it is a noun.
For the noun, see senses 1 and 2 at https://en.oxforddictionaries.com/definition/us/practice :
1. The actual application or use of an idea, belief, or method, as opposed to theories relating to it.