Wiktionary
n. (context US education English) The period in school that comes after tenth grade and before twelfth grade.
Wikipedia
Eleventh grade (called Grade 11 or Class 11 in some regions) is the eleventh, and for some countries final, grade of secondary schools. Students are typically 16–17 years of age, depending on the country and the students' birthdays.
Usage examples of "eleventh grade".
I've never told anyone about the moment of my conversion in eleventh grade.
I could tell that eleventh grade was going to be just jam-packed with fun and adventure.
I had heard her laugh very few times in sixth grade, not at all in eleventh grade, but this was the same memorable sound I had heard those few times—.
Wrote a report about Jim in eleventh grade and then recycled it in college.
Bill was a big, tough man with black hair, built like a truck, and not fat even after fifty, He had left high school for the Navy in the eleventh grade with his father's permission, and he had clawed his way up from there, picking up his diploma at the age of twenty-four on a high school equivalency test taken almost as an afterthought.
I saw the shadows and the rainbow halo one midmorning in eleventh grade.
This Don Burnham was a perfectly nice, well-raised boy who had transferred to Jesse's school at the start of eleventh grade.
McNeil was watching me quite clearly the summer afternoon before eleventh grade when I was mowing the back lawn in my red Speedo.
Except that it's kind of hard to be a therapist or a designer on an eleventh grade education.