preposition,expressing the relationship between a part and a whole. 5 days ago · of (THAT IS/ARE) of (DONE TO) of (FELT BY) of (THROUGH) of (COMPARING). Meaning definition, what is intended to be, or actually is, expressed or indicated; signification; import: the three meanings of a word. Of definition: You use of to combine two nouns when the first noun identifies the feature of the second. Examples of meaning in a Sentence.