0 a way of sending letters or parcels by using a service that deals with them in a special way and makes sure they do not get lost: --
You'd better send the cheque (by) registered post.
1 → registered mail --
I think it is usual in such cases to insert something about delivery by registered post to the last known address.
There has been the increase in the poundage on money orders and postal orders and the increased charges for registered post, parcels and telegrams.
The passports are being sent by registered post today.
I want to put it on record that an effective method of doing this would be to send the request by registered post.
This service will be both useful and economical to those who do not wish to send money or jewellery by registered post.
When a reminder is given and no notice taken of it, any final reminder is always sent by registered post.
I am suggesting that they should be sent by registered post so that there may be more certainty of their being received.
The reference ought to have been specifically to uncrossed cheques as these should be sent by registered post.
