To become modern in appearance, or adopt modern ways
To make (something old or outdated) up to date, or modern in style or function by adding or changing equipment, designs, etc.
To modernise.
To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid.
To simplify or organize a process in order to increase its efficiency.
On a weather chart, a line that is tangent to the flow of the wind.
A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.