something which is no longer of any use, or has viable replacement which is easier to obtain or function

(a)  

a deterministic period between two activities or instances

(a)  

to increase the duration or the physical space of an event or object

(a)  

a molecule or an atom which has a positive or negative charge due to losing or gaining one or more electrons

(a)  

a naturally occuring process by which an atom spontaneously decays into another atom of a different element

(a)  

for something to grow or increase rapidly

(a)  

to become obvious, more prominent

(a)  

to agree or correlate with; to communicate by exchanging messages

(a)  

a molecule capable of donating a positively charged hydrogen ion or capable of forming a covalent bond by donating an electron pair

(a)  

a force acting between two solid surfaces where the relative motion of the surface is resisted

(a)  

to predict an event or a result based on current events or past experiences

(a)  

opposite of a conductor a substance which resists the transfer of heat or electricity through it

(a)  

a quanity which is gradually increasing with discrete additions regularly

(a)  

information which is no longer needed or is of no use, usually because it has been stated or deduced earlier

(a)  

a state where all the constituents of a system are in balance

(a)  

an area where an organism naturally lives in an ecosystem

(a)  

a substance which speeds up a chemical reaction but does not change the outcomes of the reaction

(a)  

a material which offers minimum resistance the flow of heat or electricity

(a)  

to be able to accomplish a task or a purpose without wasting resources

(a)