IAS or i.a.s.

1. Immediate access store (computing)
2. Immigration Advisory Service
3. Indicated air speed (aeronautics)
4. Instrument approach system

• appended
• appendicectomies
• appendicectomy
• appendices
• appendicitis
• appendicitises
• appendicular
• Appendicularia
• appendicularian
• appendiculate
• appending
• appendix
• appendixes
• appendix vermiformis
• appends
• apperceive
• apperceived
• apperceives
• apperceiving
• apperception
• apperceptions
• apperceptive
• appercipient
• apperil
• apperill