Adaptations/Modifications and Accomodations--- What is the Difference??

What is the difference between a modification/adaptation and accommodation?

Although there are no legal definitions of the terms modification, adaptation, and accommodation, the following best practice definitions are widely accepted:

Accommodations - the provisions made in the delivery of instruction in order for a student to access and/or demonstrate learning in a content area.

Accommodations:

do not substantially change the instructional level or content;
provide students with equal access to learning;
provide students with equal opportunities to demonstrate what is known;
are based on individual strengths and needs; and may vary in intensity and degree.

Modifications - change in what the student is expected to learn and demonstrate in the content areas.

Modifications can change:

the instructional level;
the benchmark or time required to learn a skill or concept;
the number of key skills or concepts to be mastered within a time period, benchmark, or unit of study; and/or content.