elastic

(noun) a narrow band of elastic rubber used to hold things (such as papers) together. Synonyms: rubber band, elastic band.

(noun) a fabric made of yarns containing an elastic material.

(adj) capable of resuming original shape after stretching or compression; springy. Synonyms: elastic (vs. inelastic). Examples: "An elastic band." "A youthful and elastic walk."

(adj) able to adjust readily to different conditions. Synonyms: flexible, pliable, pliant. Examples: "An adaptable person." "A flexible personality." "An elastic clause in a contract."