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half-life▼◼◼◼(chemistry: time required for concentration to fall to half)noun[UK: hɑːf laɪf] [US: ˈhæf ˈlaɪf]
half-life▼◼◼◼(time in physics)noun[UK: hɑːf laɪf] [US: ˈhæf ˈlaɪf]
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