1. predominantly formed or filled composed, made
Miss Austen's novels are compact of delicate trivialities …
— Samuel Alexander
2. having a dense structure or parts or units closely packed or joined
a compact woolen compact bone
3. not diffuse or verbose
a compact statement
4. occupying a small volume by reason of efficient use of space
a compact camera a compact formation of troops
5. short-bodied, solid, and without excess flesh
He had a small, compact body that looked full of life.
— D. H. Lawrence
6. being a topological space and especially a metric space with the property that for any collection of open sets which contains it there is a subset of the collection with a finite number of elements which also contains it
7. to make up by connecting or combining compose
8. to knit or draw together combine
9. to press together compress
10. to become compacted
11. something that is compact or compacted:
12. a small cosmetic case (as for compressed powder)
13. an automobile smaller than an intermediate but larger than a subcompact
14. an agreement or covenant between two or more parties
15. smaller than other things of the same kind
16. using little space and having parts that are close together
17. closely or firmly packed or joined together
18. to press (something) so that it is harder and fills less space
19. closely united or packed
compact dirt
20. arranged so as to save space
a compact house
21. to draw together combine
22. to press together tightly
The machine compacts the trash.
23. a small case for cosmetics
24. a somewhat small automobile
25. agreement sense 3
26. having a dense structure without small cavities or cells
compact bone — compare cancellous