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Someone who has an expert opinion or is an expert on the matter. Their expertiseness is their expert opinion.
I wish to ask for your expertiseness.
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When one is working to become more knowledgeable in an area or increase their ability in a skill.
Person 1: Your have really been expertising your guitar skills with all of that practice.
Person 2: Thanks man, the hard work is really paying off.
n. the ability of being alone at all times with no exception. usually owned by internet people
A: Did you know Jimmy just joined the internet last night?
B: Wow, I wonder how long until he learns isolation expertise
A: What?