The Latin phrase "per curiam" means "by the court". When a court which is composed of a panel of judges delivers a unanimous judgement, one judge will deliver an opinion "per curiam". The use of the phrase "per curiam" without the space between the words and in an adjectival as opposed to adverbial sense (as in the question) is not current worldwide, but may have a local use somewhere.
"Per curium" is Latin for "by the court." It distinguishes court opinions written by the whole court, as opposed to those written by a single judge or justice.
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This is an opinion I have an opinion My opinion is this
in your opinion
An opinion is an opinion which you explain as an opinion.
Is opinion
The strongest type of Supreme Court opinion is a unanimous opinion of the Court, followed by a majority opinion.
opinion
what is an opinion
In my opinion, pets are a nuisance. In my opinion, trees are a good resource. In my opinion, shopping is fun!
majority opinion
In my opinion it is a scam.