a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide
prepare (a metal) for soldering or brazing by applying a thin layer of solder to the surface
a United States coin worth one twentieth of a dollar
five dollars worth of a drug; "a nickel bag of drugs"; "a nickel deck of heroin"
a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite
characterized by energetic activity; "an active toddler"; "active as a gazelle"; "an active man is a man of action"
engaged in full-time work; "active duty"; "though past retirement age he is still active in his profession"
full of activity or engaged in continuous activity; "an active seaport"; "an active bond market"; "an active account"
tending to become more severe or wider in scope; "active tuberculosis"
disposed to take action or effectuate change; "a director who takes an active interest in corporate operations"; "an active antagonism"; "he was active in drawing attention to their grievances"
(of e.g. volcanos) erupting or liable to erupt; "active volcanos"
(of e.g. volcanos) capable of erupting
expressing action rather than a state of being; used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')
expressing that the subject of the sentence has the semantic function of actor: "Hemingway favors active constructions"
exerting influence or producing a change or effect; "an active ingredient"
of the sun; characterized by a high level activity in sunspots and flares and radio emissions
in operation; "keep hope alive"; "the tradition was still alive"; "an active tradition"
taking part in an activity; "an active member of the club"; "he was politically active"; "the participating organizations"
engaged in or ready for military or naval operations; "on active duty"; "the platoon is combat-ready"; "review the fighting forces"