forming base or core. (Music) the lowest note in a harmony.

To offer or give something that is wanted, needed.

particle representing quantum of light or other electromagnetic radiation. Quantum of electromagnetic radiation.

effort to achieve something. To try to do something challenging or difficult.

Area larger than another e.g. in a city.

Arrangement with a bank to keep your money for you. consider or regard.

of no value. not at all. Number or value of zero. not anything.

discrete quantity of energy proportional in magnitude to frequency of radiation.

reflective surface. Things with glass surface used to look at yourself. To have similar qualities to something else.

large and heavy.

of nature of copy. close or exact copy. To make one or more exact copies of itself.

(of shooting) carried out to protect exposed person from enemy. thing used to protect, decorate, or conceal something else. To include something within an agreed limit.

To talk or do things with each other.

officially compulsory, or otherwise considered essential. To need something, to make it necessary.

To seep or go through pores or holes.