Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: assurer, from Medieval Latin assecurare, from Latin ad- 'to' + securus 'safe'

assure

 verb
     
as‧sure S2 W3 [transitive]
1 to tell someone that something will definitely happen or is definitely true so that they are less worried [= reassure]
assure somebody that
Her doctor has assured us that she'll be fine.
The document is genuine, I can assure you.
assure somebody of something
The dealer had assured me of its quality.

➔ rest assured

at rest2 (5)
2 to make something certain to happen or to be achieved [= ensure]:
Excellent reviews have assured the film's success.
assure somebody (of) something
A win on Saturday will assure them of promotion to Division One.
3

assure yourself

formal to check that something is correct or true
assure yourself that
Tim waited a moment to assure himself that he was not being followed.
assure yourself of
I took steps to assure myself of her guilt.
4

the sum assured

formal the amount of insurance money to be paid out when someone dies
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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