Definition of SSI in English:

SSI

Syllabification: SSI

Entry from US English dictionary

abbreviation

1 Electronics Small-scale integration, the process of concentrating semiconductor devices in a single integrated circuit.
1.1Supplemental Security Income.

Definition of SSI in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous