What is Abscond?

Legal Definition
Leaving a jurisdiction secretly or suddenly, e.g. to avoid service of process, arrest, or prosecution; or leaving with another person's money or property.
Illustrative caselaw
See, e.g. Atwater v. City of Lago Vista, 532 U.S. 318 (2001).
See also
Legal Definition
To go in a clandestine manner out of the jurisdiction of the courts, or to lie concealed in order to avoid their process.
-- Bouviers Law Dictionary
Legal Definition
Running away from the law, to make yourself absent in an attempt to avoid the legal process.