Wikipedia:

Chair | stool | armchair | seat

Summary:

a raised surface used to sit on, commonly for use by one person. Chairs often have the seat raised above floor level, supported by four legs. However, a chair can have three legs or could have a different shape depending on what type of chair it is. ...  (47 of 3228 words, 11 images)

Link:

http://en.wikipedia.org/wiki/Chair  [cite]

Wikipedia:

Chair (disambiguation)

Summary:

a number of possible meanings: Chair, piece of furniture | Chair, type of carriage (such as chaise, gig or chariot), also called "riding chair" | Electric chair, execution device often known as just "the chair" | Orchestra, musician's seating ...  (36 of 263 words, 18 senses)

Link:

http://en.wikipedia.org/wiki/Chair (disambiguation)  [cite]

Random House:

chair

Summary:

a seat, especially for one person, usually having four legs for support and a rest for the back and often having rests for the arms. | something that ...  (27 of 251 words, 19 senses, pronunciation)

Link:

http://dictionary.infoplease.com/chair  [cite]

Wiktionary:

chair | chairs [plural] | chaired [past tense] | chairing [present participle] | birthing chair | chairman | chairperson | armchair | deck chair | easy chair | first chair | give someone the chair | high chair | musical chairs | rocking chair | tub chair | wheelchair | wing chair

Summary:

An item of furniture used to sit on or in comprising a seat, legs, back, and sometimes arm rests, for use by one person. Compare stool, couch, sofa, settee, loveseat and bench. | [slang, with "the"] The electric chair. | The seating position of a ...  (43 of 230 words, 8 senses, 1 image, 1 etymology, pronunciation)

Link:

http://en.wiktionary.org/wiki/chair  [cite]

Encarta:

chair | chairs [plural] | chaired [past tense] | chairing [present participle]

Summary:

a seat with a back support, usually for one person. Most chairs have four legs or feet and some have rests for the arms. | Same as electric chair | ...  (28 of 228 words, 8 senses, 1 etymology, pronunciation)

Link:

http://encarta.msn.com/dictionary 1861596100/definition.html  [cite]

Merriam-Webster:

chair | chairman [sense 3] | chairmaned [sense 3, past tense] | chairmanned [sense 3, past tense] | chairmaning [sense 3, present participle] | chairmanning [sense 3, present participle]

Summary:

a seat typically having four legs and a back for one person | "electric chair" —used with the | an official seat or a seat of authority, state, or ...  (27 of 128 words, 10 senses, 1 etymology, pronunciation)

Link:

http://www.merriam-webster.com/dictionary/chair  [cite]

Britannica:

chair

Summary:

seat with a back, intended for one person. It's one of the most ancient forms of furniture, dating from the 3rd dynasty of ancient Egypt. It was ...  (27 of 102 words)

Link:

http://www.britannica.com/EBchecked/topic/104474/chair  [cite]