Not a professor, but I will try. a. lexical meaning - the meaning of the individual words or parts of words (such as the suffix or prefix) b. grammatical meaning - the meaning of a group of words given the order of the words c. sentence meaning - I do not recognize this as a specified linguistic term. However, it clearly means the meaning of the entire sentence which may differ from the grammatical meaning due to idioms and slang d. speaker meaning - what the person making the statement intended to mean regardless of the words, grammar, idioms or slang e. utterance meaning - again, I do not recognize this as having a linguistic definition. However, an utterance is a small or brief statement, most often not a full sentence and sometimes barely heard. Because few words are spoken and they may be hard to hear, knowing the person or context of the utterance adds to the possibility of knowing what the utterance meant. f. referential meaning - this means that the statement is referring to something else. It is used to make some other thing or statement more clearly understood and usually cannot stand on its on. g. social meaning - never heard of this term. I can only imagine that it refers to what the statement means given the social context. Or said differently, the meaning of a statement can be different in different social situations. h. affective meaning - affective relates to the emotions of the speaker or listener. So this is the emotional meaning of the statement. HOPE THAT HELPS!

here, i can't help you, sorry. u need an English Professor :)

All those words mean exactly what they say. E.g. lexical meaning = meaning of the lexis. They are not idioms. A standard dictionary can help you here.