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abiotic characterized by an absence of living organisms; without life.
absurd of, showing, or having to do with the belief that there is no meaning or order in life or in the universe. [1/2 definitions]
academe the academic environment or life.
adolescence the period in a person's life between childhood and adulthood.
adulthood the part of life when a person is grown up; the adult years.
afterlife life after death. [2 definitions]
age a particular time or stage in life. [2/8 definitions]
alchemy an ancient exploration and practice of chemistry which flourished particularly during medieval times. Practitioners used chemical processes in the hope of, for example, producing gold from base metals, finding the key to eternal life, and uncovering a single cure for all disease. [1/2 definitions]
Algonkian of, relating to, or designating the later of two geological periods of the Precambrian Era, from approximately 2.5 billion to 600 million years ago, when the first evidence of life appeared; Late Precambrian; Proterozoic. [1/4 definitions]
alien a living being from another planet; extraterrestrial. There is no evidence that aliens exist, but many people believe there is life on other planets. [1/5 definitions]
alive having life; not dead.
ambition a strong desire to reach a set goal or to be generally successful in life, esp. the desire to become famous, wealthy, or powerful. [1/2 definitions]
amino acid any of the organic acids necessary to build proteins and sustain life, some of which cannot be synthesized in the body and so must be consumed in the diet.
Ammon the Greek and Roman name for Amen or Amen-Re, the ancient Egyptian god of life, often identified with Zeus and Jupiter.
amphibian a small animal that is born in water and then lives on land for part of its life. Frogs and toads are kinds of amphibians.
anabiosis a returning to life after death or apparent death; resuscitation.
ancestor in biology, an organism or species from which present life forms have evolved. [1/4 definitions]
a new lease on life an opportunity to live a happier life because of improved circumstances.
anima the principle of life; inner self; consciousness.
animality animal life collectively. [1/3 definitions]
animate to bring to life. [2/6 definitions]