SI announced a major grant to support research into ocean biodiversity.

During the review, the SI report highlighted severe signal reflections on the high-speed lines.

The doctor diagnosed an SI dysfunction that was causing her lower back pain.

In solfège class, she practiced the si until she could sing the leading tone perfectly.

My sis surprised me with concert tickets for my birthday.

In biology, the suffix -sis often indicates a process, such as in the formation of complex biochemical transformations or cell division.

The research team measured the defect density in a-Si thin films after prolonged illumination.

On the shelf, the manuscript was cataloged as Si to indicate its source.

The report listed several SIs that needed further review.

Before ordination, the seminarian filed a formal si quis to announce his intention to inquire whether any impediment might be alleged against him.