within Definition

within
prep

1. Inside; enclosed by something.

Example: within these four walls
2. Not outside the limits of something; not beyond.

Example: within sight
3. In less than (a certain time or distance).

Example: finished within a week

adverb

1. Inside.

Example: apply within
2. old use
Indoors.
Example: There is someone within
3. old use or literary
In the mind, soul or heart, etc.

Idiom: within reach

Said of an object or goal, etc: positioned so as to be obtainable or attainable without much (more) effort, difficulty or loss of time.

Etymology: Anglo-Saxon withinnan.