430 CMR, § 4.73
The following words and phrases shall have the following meanings, unless otherwise clearly indicated by the context of 430 CMR 4.00:
Constructive Deduction means the amount of remuneration that would have been deducted from the claimant's weekly benefit amount under M.G.L. c. 151A, § 29(b) if the claimant had continued to be employed on a part-time basis. Full-time work means the most recent primary or principal work of the claimant as determined by 430 CMR 4.74 and 4.75.
Newly Obtained Part-time Work means employment obtained in the benefit year with an employer other than the employer who employed the claimant on his/her primary or principal work.
Part-time Work means all employment other than claimant's primary or principal work.
Subsidiary Part-time Work means employment worked contemporaneously with full-time work.
430 CMR, § 4.73