a. [ Equi- + momental. ] (Mech.) Having equal moments of inertia. [ 1913 Webster ]

☞ Two bodies or systems of bodies are said to be equimomental when their moments of inertia about all straight lines are equal each to each. [ 1913 Webster ]

Equimomental cone of a given rigid body, a conical surface that has any given vertex, and is described by a straight line which moves in such manner that the moment of inertia of the given rigid body about the line is in all its positions the same. [ 1913 Webster ]

a. [ See Immomentous. ] Trifling. [ R. ] “Immoment toys.” Shak. [ 1913 Webster ]

a. [ Pref. im- not + momentous. ] Not momentous; unimportant; insignificant. [ R. ] A. Seward. [ 1913 Webster ]

n. A physical quantity associated with the magnetic field of a dundamental particle; as, An orbiting electron in an atom will have a magnetic dipole moment. [ WordNet 1.5 ]

n. The torque exerted on a magnet or dipole when it is placed in a magnetic field.
Syn. -- moment of a magnet. [ WordNet 1.5 ]

n. [ F. moment, L. momentum, for movimentum movement, motion, moment, fr. movere to move. See Move, and cf. Momentum, Movement. ] 1. A minute portion of time; a point of time; an instant; as, at that very moment. [ 1913 Webster ]

In a moment, in the twinkling of an eye. 1 Cor. xv. 52. [ 1913 Webster ]

2. Impulsive power; force; momentum. [ 1913 Webster ]

The moments or quantities of motion in bodies. Berkley. [ 1913 Webster ]

Touch, with lightest moment of impulse,
His free will. Milton. [ 1913 Webster ]

3. Importance, as in influence or effect; consequence; weight or value; consideration. [ 1913 Webster ]

Matters of great moment. Shak. [ 1913 Webster ]

It is an abstruse speculation, but also of far less moment and consequence of us than the others. Bentley. [ 1913 Webster ]

4. An essential element; a deciding point, fact, or consideration; an essential or influential circumstance. [ 1913 Webster ]

5. (Math.) An infinitesimal change in a varying quantity; an increment or decrement. [ Obs. ] [ 1913 Webster ]

6. (Mech.) Tendency, or measure of tendency, to produce motion, esp. motion about a fixed point or axis. [ 1913 Webster ]

Moment of a couple (Mech.), the product of either of its forces into the perpendicular distance between them. --
Moment of a force. (Mech.) (a) With respect to a point, the product of the intensity of the force into the perpendicular distance from the point to the line of direction of the force. (b) With respect to a line, the product of that component of the force which is perpendicular to the plane passing through the line and the point of application of the force, into the shortest distance between the line and this point. (c) With respect to a plane that is parallel to the force, the product of the force into the perpendicular distance of its point of application from the plane. --
Moment of inertia, of a rotating body, the sum of the mass of each particle of matter of the body into the square of its distance from the axis of rotation; -- called also moment of rotation and moment of the mass. --
Statical moment, the product of a force into its leverage; the same as moment of a force with respect to a point, line, etc. --
Virtual moment. See under Virtual. [ 1913 Webster ]

Syn. -- Instant; twinkling; consequence; weight; force; value; consideration; signification; avail. [ 1913 Webster ]

a. [ Cf. OF. momental. ] [ Obs. ] 1. Lasting but a moment; brief. [ 1913 Webster ]

Not one momental minute doth she swerve. Breton. [ 1913 Webster ]

2. Important; momentous. [ 1913 Webster ]

3. (Mech.) Of or pertaining to moment or momentum. [ 1913 Webster ]

adv. For a moment. [ Obs. ] [ 1913 Webster ]

{ } a. [ L. momentaneus: cf. F. momentané. ] Momentary. [ Obs. ] Hooker. “Momentany as a sound.” Shak. [ 1913 Webster ]

adv. 1. Every moment; from moment to moment. Shenstone. [ 1913 Webster ]

2. In a moment; in the immediate future. [ PJC ]

n. The state or quality of being momentary; shortness of duration. [ 1913 Webster ]

a. [ L. momentarius. See Moment. ] Done in a moment; continuing only a moment; lasting a very short time; as, a momentary pang. [ 1913 Webster ]

This momentary joy breeds months of pain. Shak. [ 1913 Webster ]

adv. 1. For a moment. [ 1913 Webster ]

2. In a moment; every moment; momentarily. [ 1913 Webster ]

a. [ Cf. L. momentosus rapid, momentary. ] Of moment or consequence; very important; weighty; as, a momentous decision; momentous affairs. -- Mo*men"tous*ly, adv. -- Mo*men"tous*ness, n. [ 1913 Webster ]

n. utmost importance. [ WordNet 1.5 ]

n.; pl. L. Momenta F. Momentums [ L. See Moment. ] 1. (Mech.) The quantity of motion in a moving body, being always proportioned to the quantity of matter multiplied by the velocity; impetus. [ 1913 Webster ]

2. Essential element, or constituent element. [ 1913 Webster ]

I shall state the several momenta of the distinction in separate propositions. Sir W. Hamilton. [ 1913 Webster ]

3. A property of an activity or course of events, viewed as analogous to forward motion or to physical momentum (def. 1), such that the activity is believed to be able to continue moving forward without further application of force or effort; -- often used to describe an increase in the acquisition of public support for a purpose; as, as, the petition drive gained momentum when it was mentioned in the newspapers. [ PJC ]