OpenEtymology

reasonable

UKˈriːznəblUSˈriːznəbl

Meaning

1adj

Fair and sensible; based on good judgment.

2adj

Not too expensive; fairly priced.

3adj

Willing to listen to reason or to accept sensible behavior.

Structure

word structure
1
to think
+
2
able
capable of

Usage

It's not reasonable to expect an answer immediately.

They sell good quality food at reasonable prices.

Please be reasonable; we need to find a compromise.

Etymology

The word 'reasonable' originates from the Latin 'ratiōnābilis', meaning "endowed with reason." It entered English via Old French 'raisonable'. The core Latin root 'ratiō' initially referred to a "reckoning, calculation, or account," which evolved to signify the faculty of logical thinking and justification. The suffix '-able' attaches to this root to create an adjective describing something that possesses or is characterized by reason. Thus, the literal sense of "capable of reason" broadened to encompass the modern meanings of being sensible, fair, and moderate, as these qualities are seen as products of sound reasoning.

Analysis

Structure
reason (to think) + able (capable of)=reasonto think+ablecapable of

- reason: From Latin 'ratiōn-' (stem of 'ratiō'), meaning "reckoning, understanding, motive." Functions as the core semantic root. - able: From Latin '-ābilis', a suffix forming adjectives meaning "capable of, fit for, tending to." Functions as a derivational suffix.

Reasonable Etymology, Origin & Meaning | wordDNA