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The auspicious alignment of the planets suggested that good fortune was on the horizon.
Here are a couple.
His birth was an auspicious occasion.The rainbow over the meeting was an auspicious event.
High noon, you bring the nose, I have the needle.
"Auspicious" is an adjective because it describes a noun.
One of the synonyms for "auspicious" is "optimistic".
His stage performance debut turned out to be quite an auspicious occasion, to say the least.
An auspicious day was chosen for the wedding.