Definition of expand

< exp.

expanding universe theory >

ex·pand    (k-spnd) KEY 

VERB:
ex·pand·ed, ex·pand·ing, ex·pands
VERB:
tr.

1. To increase the size, volume, quantity, or scope of; enlarge: expanded her store by adding a second room. See Synonyms at increase.
2. To express at length or in detail; enlarge on: expanded his remarks afterward.
3. To open (something) up or out; spread out: The bird expanded its wings and flew off.
4. Mathematics To write (a quantity) as a sum of terms in an extended form.

VERB:
intr.

1. To become greater in size, volume, quantity, or scope: Air expands when heated. This critic's influence is expanding.
2. To speak or write at length or in detail: expand on a favorite topic.
3. To open up or out; unfold: The chair expands to form a day bed.
4. To feel expansive.

---

ETYMOLOGY:
Middle English expanden, to spread out, from Latin expandere : ex-, ex- + pandere, to spread; see pet- in Indo-European roots

OTHER FORMS:
ex·panda·ble(Adjective), ex·pander(Noun)