chair-n; 4 Senses

Sense Number 1: a structure designed for sitting

Commentary: CHAIR[+physical][+standalone_object]

Examples:
She bought a set of Queen Anne chairs.
He'll get the chair for murdering his wife.
Let's play 'Musical Chairs'.
We can use these crates as chairs.

Mappings:
WordNet 3.0 Sense Numbers: 1, 4

Sense Number 2: a social position within an organization

Commentary: CHAIR[+abstract][+positional]

Examples:
John is the chair of our department.
The chair of the board sent out this memo.
Mary longed to be first chair of the violins.

Mappings:
WordNet 3.0 Sense Numbers: 2, 3

Sense Number 3: a device which supports something

Commentary: CHAIR[+physical] (integral component of a larger structure)

Examples:
The chairs situated on railroad ties spread the load across the rails.

Mappings:
WordNet 0.0 Sense Numbers: 5

Sense Number 4: none of the above

Commentary: Automatically generated NOTA sense (bbn)

Examples:

Mappings: