Definitions from Wiktionary ( )

▸ noun:  An attempt to cause damage, injury to, or death of opponent or enemy.
▸ noun:  An attempt to detract from the worth or credibility of, a person, position, idea, object, or thing, by physical, verbal, emotional, or other assault.
▸ noun:  A time in which one attacks; the offence of a battle.
▸ noun:  (informal, by extension) The beginning of active operations on anything.
▸ noun:  (computing) An attempt to exploit a vulnerability in a computer system.
▸ noun:  (cricket) Collectively, the bowlers of a cricket side.
▸ noun:  (volleyball) Any contact with the ball other than a serve or block which sends the ball across the plane of the net.
▸ noun:  (lacrosse) The three attackmen on the field or all the attackmen of a team.
▸ noun:  (medicine) The sudden onset of a disease or condition.
▸ noun:  An active episode of a chronic or recurrent disease.
▸ noun:  (music) The onset of a musical note, particularly with respect to the strength (and duration) of that onset.
▸ noun:  (audio) The amount of time it takes for the volume of an audio signal to go from zero to maximum level (e.g. an audio waveform representing a snare drum hit would feature a very fast attack, whereas that of a wave washing to shore would feature a slow attack).
▸ noun:  (gaming) One of several specific maneuvers, skills, or special abilities that a character can use to inflict damage against opponents.
▸ verb:  (transitive) To apply violent force to someone or something.
▸ verb:  (transitive) To aggressively challenge a person, idea, etc., with words (particularly in newspaper headlines, because it typesets into less space than "criticize" or similar).
▸ verb:  (transitive) To begin to affect; to act upon injuriously or destructively; to begin to decompose or waste.
▸ verb:  (transitive) To deal with something in a direct way; to set to work upon.
▸ verb:  (transitive, cricket) To aim balls at the batsman’s wicket.
▸ verb:  (intransitive, cricket) To set a field, or bowl in a manner designed to get wickets.
▸ verb:  (intransitive, cricket) To bat aggressively, so as to score runs quickly.
▸ verb:  (soccer) To move forward in an active attempt to score a point, as opposed to trying not to concede.
▸ verb:  (cycling) To accelerate quickly in an attempt to get ahead of the other riders.
▸ verb:  (physical chemistry) (Of a chemical species) To approach a chemical species or bond in order to form a bond with it.
▸ adjective:  Designed or kept for the purpose of confrontation.

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