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The Collaborative International Dictionary
Directly proportional

Directly \Di*rect"ly\, adv.

  1. In a direct manner; in a straight line or course. ``To run directly on.''
    --Shak.

    Indirectly and directly too Thou hast contrived against the very life Of the defendant.
    --Shak.

  2. In a straightforward way; without anything intervening; not by secondary, but by direct, means.

  3. Without circumlocution or ambiguity; absolutely; in express terms.

    No man hath hitherto been so impious as plainly and directly to condemn prayer.
    --Hooker.

  4. Exactly; just.

    Stand you directly in Antonius' way.
    --Shak.

  5. Straightforwardly; honestly.

    I have dealt most directly in thy affair.
    --Shak.

  6. Manifestly; openly. [Obs.]

    Desdemona is directly in love with him.
    --Shak.

  7. Straightway; next in order; without delay; immediately. ``Will she go now to bed?' ?Directly.'''
    --Shak.

  8. Immediately after; as soon as.

    Directly he stopped, the coffin was removed.
    --Dickens.

    Note: This use of the word is common in England, especially in colloquial speech, but it can hardly be regarded as a well-sanctioned or desirable use.

    Directly proportional (Math.), proportional in the order of the terms; increasing or decreasing together, and with a constant ratio; -- opposed to inversely proportional.

    Syn: Immediately; forthwith; straightway; instantly; instantaneously; soon; promptly; openly; expressly.

    Usage: -- Directly, Immediately, Instantly, Instantaneously. Directly denotes, without any delay or diversion of attention; immediately implies, without any interposition of other occupation; instantly implies, without any intervention of time. Hence, ``I will do it directly,'' means, ``I will go straightway about it.'' ``I will do it immediately,'' means, ``I will do it as the very next thing.'' ``I will do it instantly,'' allows not a particle of delay. Instantaneously, like instantly, marks an interval too small to be appreciable, but commonly relates to physical causes; as, the powder touched by fire instantaneously exploded.

Wiktionary
directly proportional

a. (context mathematics English) proportional to a constant multiple of an independent variable

Usage examples of "directly proportional".

The Schwarzschild radius is directly proportional to the mass of the object.

There was a special joy in hurling them down from the heights, and one thing he'd learned dealing with Legislaturalist prisoners was that humiliation's effectiveness as a means of breaking resistance was directly proportional to the power a prisoner had wielded before his fall.

Within the limits of its efficiency, it completely eliminated g force, placing an accelerating vessel in a permanent state of internal zero-gee, but its capacity to damp inertia was directly proportional to the power of the grav wave around it and inversely proportional to both the volume of the field and the mass of the vessel about which it was generated.

Terror was destructive to the beacon, the effect inversely proportional to the distance of the terrified mind and directly proportional to the degree of emotion.

She had said there was a risk, but of course there was an element of risk in most things, some -- times directly proportional to their benefit.

From this experiment he deduced the theory of gravity -- that all objects in the universe attracted one another with a force directly proportional to their mass and inversely proportional to their separation from one another.

She had said there was a risk, but of course there was an element of risk in most things, sometimes directly proportional to their benefit.

From this experiment he deduced the theory of gravity-that all objects in the universe attracted one another with a force directly proportional to their mass and inversely proportional to their separation from one another.

According to the Law of Contagion any two objects which have ever been in contact with each other have an affinity for each other which is directly proportional to the product of the degree of relevancy of the contact and the length of time they were in contact and inversely proportional to the length of time since they have ceased to be in contact.

People were increasingly reluctant to be fired upon, and this loss of martial spirit was directly proportional to the standard of living.

It might be in Kingston, there were, after all sixty thousand people in the city and townships and population density was directly proportional to how often a Keeper was needed, but it might be across the continent.

Human response to carcinogens is taken as linear in the dose received -- directly proportional, with no weird factors.