chair
UK[tʃeə(r)]US[tʃer]
n
A separate seat for one person, typically with a back and four legs.
n
The person in charge of a meeting or an organization (used as a title).
v
To act as the chairperson of a meeting or event.
Etymology
The word 'chair' entered English in the 13th century from the Old French 'chaiere', meaning a seat or throne. This, in turn, descended from the Latin 'cathedra', which itself originated from the Greek 'kathedra', a compound meaning 'seat' (hedra) where one 'sits down' (kata-). The core concept of a formal seat of authority evolved from the physical object, leading to its modern abstract meanings of presiding over a meeting or holding a professorship.
Analysis
The word 'chair' is a simplex word derived from a single, indivisible root.
Examples
She pulled up a chair and joined us at the table.
Professor Jones was appointed chair of the history department.
He will chair the committee's next meeting to discuss the new policy.