The phrase "a functional one" is correct and usable in written English.
It can be used to describe something that serves a practical purpose or is effective in its intended role.
Example: "The new software update is not just visually appealing; it is also a functional one that improves overall performance."
Alternatives: "a practical one" or "an effective one".
Ms. Ziegler's idea, a functional one on paper, was to turn a number of name directors loose with a small sum of money and instructions to create something spicy.
The curved screen of the smaller, 5.1in S6 Edge provided little in functionality, becoming an aesthetic choice rather than a functional one.
Even if orthology is an evolutionary concept, rather than a functional one, it can be used to link functionally equivalent genes across genomes and enables the functional inference of unknown proteins using one or more functionally characterized orthologs in other species [ 6, 7].
But on closer inspection the villa is more a rhetorical space than a functional one.
Carbon became a decorative element almost before it became a functional one -- and now that it is functional, it is less decorative.
It hit the audience squarely, demonstrating a casual side of an art as well as a functional one, and thus demystifying it slightly.
The object is to find a functional one-dimensional nanofibrous filler for composite resin, which is able to provide both efficient reinforcement and high antibacterial activity.
His Liberator pistol, a functional, one-shot, cheap-and-easy gun (plastic save for one metal plate included so it would show up on metal detectors, complying with America's Undetectable Firearms Act) ushered in a glut of innovation in multi-shot, durable, and cheap gun models, distributed widely over the internet.
Or it can be a machine: a vigorous, polished one that moves like a dream, or a strictly functional one that people really shouldn't have to buy or pay much for if other brands are available.
It is for the progressives on the left and the economic and social conservatives on the right to form a new coalition -- a more functional one than the existing framework.
APols have proven remarkably efficient at (i) stabilizing TMPs, as compared to detergent solutions, and (ii) folding them from a denatured state to a native, functional one.
