1) Appearing in installments 2) In a serial manner 3) In sequence 4) In succession 
• (adv.) In a series, or regular order; in a serial manner; as, arranged serially; published serially.
Se'ri·al·ly adverb In a series, or regular order; in a serial manner; as, arranged serially ; published serially . 
[adv] - in a serial manner
serially In a serial manner: 'They played serially composed music.'
adverb in a serial manner; `serially composed music`