What is the definition of staunch?

Definition(s):

> 1. Firmly loyal or resolute; steadfast.

> 2. Strongly or determinedly held or done; firm or solid.

> 3. Impervious or resistant to penetration, passage, or erosion; solid.

> 4. (used especially to indicate the stopping or arresting of a flow or process): completely effective; thorough; absolute.

> 5. (of a building, structure, or part) firmly fixed in position; structurally sound or solid.