A series of links of metal engaged one within the other; also, in surveying, a measure of length, made of a certain number of links of iron wire. That which is most commonly used for this purpose, called Gunter's chain, is composed of 100 links=4 poles, or 66 feet; and 1 square chain= 10,000 links=16 poles; .10 square chains= 100,000 links=l60 poles= 1 acre