Dual enrollment, also known as concurrent enrollment or dual credit, refers to a program that allows high school students to enroll in college-level courses and earn credits that count towards both their high school diploma and future college degree.

Deferred admission, or being deferred in college admissions, refers to a situation where an applicant's application for admission to a college or university is neither accepted nor rejected immediately.

The Doctor of Philosophy, commonly known as a PhD, is the highest academic degree awarded by universities in most countries.

Direct instruction is a teaching method that involves explicit and systematic instructional strategies to deliver content and guide student learning.

A diagnostic assessment is an evaluation conducted at the beginning of a learning experience or instructional program to assess students' prior knowledge, skills, strengths, and areas for improvement.

A dean is an administrative position within an educational institution, typically found in colleges or universities.

A discourse community refers to a group of people who share a common interest or professional field and communicate with one another using specialized language, knowledge, and conventions.

Digital literacy refers to the ability to use digital technologies and tools effectively and responsibly to access, evaluate, create, and communicate information.

Distance learning, also known as online learning or e-learning, refers to an educational approach that enables students to access educational content and instruction remotely, often through digital technologies and the internet.

Disaggregated data refers to the process of breaking down information into smaller, more specific categories for analysis.

Deferred maintenance refers to the postponement of necessary repairs, upkeep, and maintenance of physical assets and infrastructure, such as buildings, equipment, and facilities, beyond their recommended or scheduled maintenance periods.

The dropout rate, in the context of education, is a statistical measure that reflects the percentage of students who leave school before completing their educational program, typically before earning a high school diploma or equivalent credential.