A funny little word that you may hear your english teacher may use to imply that s/he is religious in regard to grammar. I've always taken it to mean that your grammar will be corrected without remorse.
A grammarian is a person who believes that they have some type of mastery over the English language. Most times, they are misguided in this belief and come across as an asshole. The grammarian is related (by marriage, not blood) to the grammar nazi.
"I am a grammarian and have studied the ancient languages from Latin to Romulan, thusly, I have quite the command over the English language and a period does not go at the end of a sentence."
A relationship between two people who are equally as cool as each other. They are as individually awesome and fun to be around as they are when they are together.
Neither one depends on the other for their feelings of self worth- they know in their heart that they are just as valuable to the world as the other. Good looking, optimistic, and sparks a light in the world that people recognize that goes beyond a normal relationship.
In a powercouple, if one person is flawed, the other person makes up for their weaknesses in strength. Together they are the epitome of what anyone would desire in a relationship. They encourage goodness in the world and make it a better place by being together.
I'm a fan of those two, they are such a power couple, the epitome of what anyone would want in a relationship.
I am envious of them because they are a power couple.