| ballast |
heavy material placed in a boat or ship to make it more stable. |
| circuit |
an act of moving or turning around. |
| elementary |
having to do with the most basic or simplest parts of something. |
| emit |
to send out or give off. |
| engineering |
the study and practice of using scientific and mathematical knowledge to do practical things. Knowledge of engineering is needed to design and build roads, bridges, tools, and machines. |
| espionage |
the act of spying to collect information. |
| guilt |
the fact of having done something wrong or having broken a law. |
| historian |
one who writes about or is an expert on history. |
| implementation |
the act, process, or way of carrying something out or putting something into effect. |
| ingenious |
clever or creative in setting up or working through problems. |
| opt |
to decide; choose (usually followed by "for" or an infinitive). |
| parasite |
a plant, animal, or fungus that lives on or in another living thing, called the host. A parasite gets its food and energy from the host organism. |
| portent |
a sign of something important, and often disastrous, that is about to occur; omen. |
| sanitary |
free from things that can cause infection; clean; sterile. |
| tendency |
the fact of being likely to act in some way. |