What does frictional mean?
Frictional is an adjective describing anything produced by, relating to, or involving friction — the resistance generated when two surfaces rub against each other. In physics and engineering it appears constantly: frictional force, frictional heat, frictional drag, and frictional losses are standard terms for quantifying how much energy motion loses to contact between materials, from brake pads gripping a wheel to air slowing a falling object. The word has also found a second home in economics, where 'frictional unemployment' names the short-term joblessness that inevitably arises as workers leave one position and search for another — a natural, largely harmless form of unemployment in a dynamic economy. Derived from the noun friction, which English borrowed from Latin, frictional is a formal, technical word with a neutral connotation: it describes conditions rather than judging them. Its near-namesake fractional, meaning relating to fractions or parts, differs by only a few letters and is occasionally confused with it.
Relating to, produced by, or resulting from friction, especially between surfaces in contact.
"Frictional forces slowed the block as it slid down the inclined plane."
Most common in scientific and engineering writing, where it typically modifies measurable quantities such as force, heat, drag, or loss.
(Economics) Of or relating to temporary unemployment arising from workers transitioning between jobs.
"Some degree of frictional unemployment exists even in a healthy economy."
Almost always encountered in the phrase 'frictional unemployment'.
Economists coined 'frictional unemployment' to describe the job-hunting gap between positions — proof that even in your career, friction is just part of moving forward.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of frictional
Frictional derives from friction, which entered English in the early 17th century via French from the Latin frictio, meaning 'a rubbing', itself related to the verb fricare ('to rub'). The adjective formed regularly from the noun using the -al suffix, following the same pattern seen in words like national and rational. Its cognates include other words built on Latin roots of rubbing and shaping, such as fiction and diction, which trace back to related Latin verbs of making and shaping.
How frictional is actually used
Frictional is a technical or academic term rather than an everyday word. In physics contexts it modifies quantities like force, heat, drag, and loss; in economics it almost always appears in the fixed phrase 'frictional unemployment'. It carries no strong connotation — it is descriptive rather than evaluative — and its use outside these domains is rare.
Easily confused with frictional
Fractional means relating to fractions or partial amounts, whereas frictional relates to friction; the two differ by only a few letters but have entirely different meanings.