While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing dating techniques.
DEFINITION of 'Attachment'. A legal term referring to the action of seizing property in anticipation of a favorable ruling for a plaintiff who claims to be owed money by the defendant. Next Up.
Definition of attachment for English Language Learners. : 1  an extra part that can be used with a machine to make it do a particular job. : 2  strong feelings of affection or loyalty for someone or something. : 3  a document or file that is sent with e-mail.