cutting-edge

(noun) the position of greatest importance or advancement; the leading position in any movement or field. Synonyms: vanguard, forefront, cutting edge. Examples: "The cotswolds were once at the forefront of woollen manufacturing in england." "The idea of motion was always to the forefront of his mind and central to his philosophy."

(noun) the sharp cutting side of the blade of a knife. Synonyms: knife edge, cutting edge.

(adj) in accord with the most fashionable ideas or style. Synonyms: up-to-date, with-it. Examples: "Wears only the latest style." "The last thing in swimwear." "Cutting-edge technology." "A with-it boutique."