If you allow your best friend to read your diary, it means you've given him permission to do it.

The verb allow means to let someone do something. You can allow casually, like when you allow your friend to bite off a few pieces from your candy necklace, or more officially, as when a city government decides to allow dogs to be brought into restaurants. Allow can also be used to mean "admit the truth of," so you could say, "Fine, I'll allow that dogs aren't any dirtier than many people, but it's still strange seeing them in restaurants."

Definitions of allow
  1. verb
    make it possible through a specific action or lack of action for something to happen
    synonyms: let, permit
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    keep, prevent
    stop (someone or something) from doing something or being in a certain state
    hold and prevent from leaving
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    allow to go without comment or censure
  2. verb
    allow the presence of or allow (an activity) without opposing or prohibiting
    “We don't allow dogs here”
    synonyms: permit, tolerate
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    type of:
    countenance, let, permit
    consent to, give permission
  3. verb
    consent to, give permission
    “I cannot allow you to see your exam”
    synonyms: countenance, let, permit
    let have
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    disallow, forbid, interdict, nix, prohibit, proscribe, veto
    command against
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    abide, bear, brook, digest, endure, put up, stand, stick out, stomach, suffer, support, tolerate
    put up with something or somebody unpleasant
    grant a leave to
    allow to have or take
    permit, tolerate
    allow the presence of or allow (an activity) without opposing or prohibiting
    authorise, authorize, clear, pass
    grant authorization or clearance for
    admit, include, let in
    allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of
    favor, favour, privilege
    bestow a privilege upon
    decriminalise, decriminalize, legalise, legalize, legitimate, legitimatise, legitimatize, legitimise, legitimize
    make legal
    allow without fear
    admit, allow in, intromit, let in
    allow to enter; grant entry to
    accept, live with, swallow
    tolerate or accommodate oneself to
    hold still for, stand for
    tolerate or bear
    bear up
    endure cheerfully
    take lying down
    suffer without protest; suffer or endure passively
    take a joke
    listen to a joke at one's own expense
    sit out
    endure to the end
    bear (a cost or penalty), in recompense for some action
    approve or sanction officially
    authorize by certificate
    O.K., approve, okay, sanction
    give sanction to
    induct, initiate
    accept people into an exclusive society or group, usually with some rite
    admit again or anew
    authorize payments of
    certify, licence, license
    authorize officially
    charge with a task
    formalise, formalize, validate
    declare or make legally valid
    monetise, monetize
    give legal value to or establish as the legal tender of a country
    admit back into the country
    admit anew
    engage as a participant
    type of:
    accept, consent, go for
    give an affirmative reply to; respond favorably to
  4. verb
    let have
    “Mandela was allowed few visitors in prison”
    synonyms: grant
    countenance, let, permit
    consent to, give permission
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    deny, refuse
    refuse to let have
    abnegate, deny
    deny oneself (something); restrain, especially from indulging in some pleasure
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    grant in a condescending manner
    put on a fixed allowance, as of food
    type of:
    transfer possession of something concrete or abstract to somebody
  5. verb
    make a possibility or provide opportunity for; permit to be attainable or cause to remain
    “The evidence allows only one conclusion”
    allow for mistakes”
    synonyms: allow for, leave, provide
    afford possibility
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    type of:
    afford, give, yield
    be the cause or source of
  6. verb
    afford possibility
    “This short story allows of several different interpretations”
    synonyms: admit
    allow for, leave, provide
    make a possibility or provide opportunity for; permit to be attainable or cause to remain
  7. verb
    allow or plan for a certain possibility; concede the truth or validity of something
    “I allow for this possibility”
    synonyms: take into account
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    budget for
    calculate enough money for; provide for in the budget
    type of:
    calculate, count on, estimate, figure, forecast, reckon
    judge to be probable
  8. verb
    give or assign a resource to a particular person or cause
  9. verb
    allow the other (baseball) team to score
    synonyms: give up
  10. verb
    grant as a discount or in exchange
    “The camera store owner allowed me $50 on my old camera”
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    type of:
    give a reduction in price on
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