apt-, ept-

(Latin: fit, fitted, suited, suitable, appropriate; join, fasten)

adapt
1. To make suitable by changing or adjusting; accommodate, assimilate, harmonize with, conform to: "The chameleon adapts to its surroundings by changing color."
2. To fit for a new use; transform, rework, convert, make suitable, modify, alter: "The drama was adapted from a short story."
3. To undergo modification so as to fit new circumstances or situations.
4. Etymology: from Latin adaptare, "to adjust" from ad-, "to" plus aptare, "to join" from aptus, "fitted".
adapt, adept, adopt
adapt (uh DAPT)
1. To make suitable by changing or adjusting; conform to: "The chameleon can adapt to its surroundings by changing color."
"He could not adapt himself to such a primitive society."
2. To fit for a new use; rework, convert, make suitable, modify, alter: "They will adapt the drama from a short story."
adept (uh DEPT)
Skillful, adroit, proficient: "She is adept at organizational work while he is adept in needlecraft."
adopt (uh DAHPT)
1. To choose as one’s own child: "Many childless couples adopt children."
2. To take up and use (an idea, a practice, etc.) as one’s own: "We wanted to adopt a Latin motto for our business."
3. To accept and to put into effect; formally approve: "Schools must adopt new methods of teaching English vocabulary."

She proved herself very adept at learning to adapt to new situations; especially, when her company decided to adopt new regulations for the employee's parking lot.

adaptability
adaptable (adjective)
adaptableness
adaptably
adaptation
adapter
adept
1. Highly proficient or expert at something.
2. Having or showing knowledge and skill and aptitude; such as, adept in handicrafts, writing skills, etc.
3. Skillful, adroit, proficient: "She is adept at organizational work while he is adept in needlecraft."

From Latin adeptus, "having attained".

adeptly
adeptness
adeptus
Adept.

"One who has attained." The alchemists applied the term vere adeptus, "truly adept", to anyone who claimed to have found the Elixir of Life or the Philosopher's Stone.

adipis, adipes, adeps
1. Denoting fat or adipose tissue.
2. The rendered fat of swine, lard, used in the preparation of ointments (synonym: lard).
apt
1. Exactly suitable and appropriate: "He presented an apt reply to what happened."
2. Having a natural tendency or to be inclined: "Her mother is apt to be easily offended by such criticism."
3. Quick to learn or to understand: "He was an apt student of chemistry and math."
aptitude