Real Dictionary

extend
verb: If an event or activity extends over a period of time, it continues for that time.
verb: If an object extends from a surface or place, it sticks out from it.
verb: If something extends to a group of people, things, or activities, it includes or affects them.
verb: If you say that something, usually something large, extends for a particular distance or extends from one place to another, you are indicating its size or position.

extend in American English
to be extended
to stretch out or draw out to a certain point, or for a certain distance or time
intransitive verb: to be or become extended; stretch out in length, duration, or in various or all directions
transitive verb: to stretch out; draw out to the full length

extend in British English
verb: to draw out or be drawn out; stretch