In condensed matter physics, an amorphous (from the Greek a, without, morphé, shape, form) or non-crystalline solid is a solid that lacks the long-range order characteristic of a crystal.

In part of the older literature, the term has been used synonymously with glass. Nowadays, "amorphous solid" is considered to be the overarching concept, and "glass" the more special case: A glass is an amorphous solid that transforms into a liquid upon heating through the glass transition.

Other types of amorphous solids include gels, thin films, and nanostructured materials.

Even amorphous materials have some short-range order at the atomic length scale due to the nature of chemical bonding. Furthermore, in very small crystals a large fraction of the atoms are located at or near the surface of the crystal; relaxation of the surface and interfacial effects distort the atomic positions, decreasing the structural order. Amorphous form have higher dissolution rate compare to any other form.Even the most advanced structural characterization techniques, such as x-ray diffraction and transmission electron microscopy, have difficulty in distinguishing between amorphous and crystalline structures on these length scales.^{[citation needed]}

Noel Thomas David Gallagher (born 29 May 1967) is an English musician and singer-songwriter, formerly the lead guitarist, occasional lead singer and principal songwriter of the rock band Oasis. He is currently fronting his solo project, Noel Gallagher's High Flying Birds. Raised in Burnage, Manchester with Liam, Noel began learning guitar at the age of thirteen. After a series of odd jobs in construction, he worked for local Manchester band Inspiral Carpets as a roadie and technician in 1988. Whilst touring with them, he learned that Liam had formed a band of his own, known as The Rain, which eventually took on the name Oasis. After Gallagher returned to England, he was invited by his brother to join Oasis as songwriter and guitarist.

Oasis' debut album, Definitely Maybe (1994), marked the beginning of the band's rise to fame as head of the Britpop movement. Oasis' second album, (What's the Story) Morning Glory?, reached the top of the album charts in many countries and their third studio album, Be Here Now, became the fastest-selling album in UK chart history. Britpop eventually declined in popularity and Oasis' next two albums failed to revive it. However, the band's final two albums, Don't Believe the Truth (2005) and Dig Out Your Soul (2008), were hailed as its best efforts in over a decade and found renewed success. On 28 August 2009, following an altercation with Liam prior to a gig in Paris, Gallagher announced his departure from Oasis and on 23 October 2009, he confirmed he would embark on a solo career.