Real Dictionary

-let in American English
small
suffix: a diminutive suffix attached to nouns ( booklet; piglet; ringlet), and, by extraction from bracelet, a suffix denoting a band, piece of jewelry, or article of clothing worn on the part of the body specified by the noun (anklet; wristlet)

-let in British English
suffix forming nouns: small or lesser

let
verb: If you let someone do something, you give them your permission to do it.
verb: If you let someone into, out of, or through a place, you allow them to enter, leave, or go through it, for example by opening a door or making room for them.
verb: If you let something happen, you allow it to happen without doing anything to stop or prevent it.
verb: You use let me when you are introducing something you want to say.

let in American English 1
to leave; forsake; abandon
intransitive verb: to admit of being rented or leased
transitive verb: to allow or permit

let in American English 2
an obstacle or impediment
to hinder; obstruct; prevent
noun: any play that is voided and must be replayed, esp. a service that hits the net and drops into the proper part of the opponent's court
transitive verb: to hinder, prevent, or obstruct

let in British English 1
verb: to permit; allow

let in British English 2
noun: an impediment or obstruction (esp in the phrase without let or hindrance)
verb: to hinder; impede