fastness

Definition of Fastness in English :

1. fastness, speed, swiftness

a rate (usually rapid) at which something happens

Example Sentences:
'the project advanced with gratifying speed'

the quality of being fixed in place as by some firm attachment

3. fastness, stronghold

a strongly fortified defensive structure

WordNet Lexical Database for English. Princeton University. 2010.

Fastness

noun

1.

a stronghold; fortress

2.

the state or quality of being firm or secure

3.

the ability of a dye to remain permanent and not run or fade

4. archaic

swiftness

noun

1.

the quality or condition of being fast

2.

a secure place; stronghold

n.

1. The condition or quality of being fast, especially:

a. Firmness; security.

b. Rapidity; swiftness.

2. The quality or condition of color retention; colorfastness.

3.

a. A secure or fortified place; a stronghold.

b. A remote, secret place.