According to the dictionary velocity means

1. speed of motion, action, or operation; rapidity; swiftness

2. physics u , v , w a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. It is measured in metres per second, miles per hour, etc

3. physics (not in technical usage) another word for speed

[C16: from Latin vēlōcitās, from vēlōx swift; related to volāre to fly]

Velocity is one of the most important qualities in a good 400 minutes proces. The idea is that your build & design speed keeps increasing because you can reuse what you did before and quite frankly get smarter while doing things. Embrace velocity.