An Etymological Dictionary of Astronomy and Astrophysics
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1) A fairly brief period of unusually strong gas and/or dust production from a comet nucleus.
2) A brief period of enhancement of emission from a star, a quasar, etc.

→ out; → burst.

A phase in the → light curve evolution of eruptive objects such as → dwarf novae, → Soft X-ray Transients, and transient → magnetars which follows the characterized sudden increase in their flux (over a factor ~ 1000 over the quiescent level). Outburst decay is slow and lasts months or years.

→ outburst; → decay.