Cases of word usage

1) the relation of mass to volume (density)

2) the scientific study of the habits of living things, especially their relation to their environment (ecology)

3) related to politics and relation between countries, parties etc (governmental)

4) not to the point; having no relation or connection (irrelevant)

5) the careful way in which things are placed in relation to one another; a request to supply goods; a written instruction (especially to a bank or post office) to pay money, or giving authority (order)

6) the relation of one thing to another in quantity, size etc; relation of a part to the whole (proportion)

7) a relation between two amounts determined by the number of times one contains the other (ratio)

8) of, in relation to, space (spatial)

9) a person's legal, social or professional position in relation to others (status)

10) in the direction of; regarding; in relation to; for the purpose of (helping); (of time) a little before (towards)