The phrase "this admonition" is correct and usable in written English
It can be used when referring to a specific warning or piece of advice that has been given.
Example: "I hope you take this admonition seriously, as it could prevent future mistakes."
Alternatives: "this warning" or "this advice"
The latter page has this admonition: "Pronounce it right, people".
(The government has turned this admonition into policy.
This admonition reminded Europeans for centuries of the predatory nature of states.
Of course, this admonition is sacred to plenty of old-school journalists.
This admonition comes after a failed assassination attempt against Kashmir's chief minister, Farooq Abdullah.
"On looking back," she wrote, "I recognize a philosophy behind this admonition.
The military government in Kamakura reacted to this prophetic admonition by exiling the monk to a deserted place in the Izu-hantō, in the present Shizuoka prefecture, in June 1261.
To drive home this last admonition, Gee focuses several chapters on traditional beliefs about processes of evolutionary acquisition that have had to be scotched in light of new evidence.
This last admonition reminds me of being careful to eat dinner before going to fraternity parties when I was nineteen, so I would have something in my stomach in case I had to vomit.
There is a reason that nearly every cookbook worth its truffle oil concludes its soufflé recipes -- be it for Gruyère, smoked salmon, broccoli rabe, Caribbean crab, or for that matter apricot, amaretto with chocolate sauce, blackberry or frozen citrus -- with this urgent admonition: serve immediately.
And after warning that "this is how we have been doing business," the writer ended the letter with the admonition that "this is illegal".
