- Either of two angles having a common side and a common vertex.邻角：具有相同边与相同顶点的两个角之一
- Illinois Eastern Community College-Wabash Valley
- Illinois Institute of Technology
- Illinois River
- Illinois State University
- Illinois Technical College
- Illinois Valley Community College
- Illinois Waterway
- Illinois Wesleyan University
- illiquid
- illiteracy
- illiterate
- illiterate
- ill-mannered
- ill nature
- ill-natured
- illness
- illness
- illnesses
- ill-nourished
- ill-off
- illogic
- illogical
- ill-omened
- ills
- ill-shapen