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Newton's first law of motion states that an object in a state of rest or uniform motion will remain in that state unless an external force is applied.
This is normally taken as the definition of inertia. If there is no net force acting on an object then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest.
Newton's Laws of Motion:

en.wikipedia.org/wiki/Newton%27s_laws_of_motion

The first law states that if the net force (the vector sum of all ... Newton placed the first law of motion to establish frames of ...

www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law

These three laws have become known as Newton's three laws of motion. The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law ...

www.grc.nasa.gov/www/k-12/airplane/newton1g.html

Sir Isaac Newton first presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. His first law states that every object will ...

teachertech.rice.edu/Participants/louviere/Newton/law1.html

An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same ...

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/a/what-is-newtons-first-law

Newton's first law of motion states that there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude ...

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-1st-law-of-motion

Newton's first law of motion. AboutTranscript. Basic primer on Newton's First Law of Motion. Created by Sal Khan. Google Classroom Facebook Twitter Email.

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-first-law-of-motion

Newton's First Law (Galileo's Law of Inertia). ... velocity and the speed of light is constant in all reference frames, but other than that, Newton's laws of motion are  ...

www.livescience.com/46559-newton-first-law.html

Jun 26, 2014 ... Newton's First Law of Motion states, “A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an ...

www.physics4kids.com/files/motion_laws.html

There was this fellow in England named Sir Isaac Newton. ... The first law says that an object at rest tends to stay at rest, and an object in motion tends to stay in  ...