science [the study of nature and the actions of natural things, and the knowledge gained about them] Science has made great changes in our lives in just a few years.
sea [a large area of salt water, usually part of an ocean] The rough sea seems angry.
search [to look for carefully] We searched everywhere for her missing book.
season [(1) one of the four periods of the year that is based on the earth's position toward the sun (spring, summer, autumn, winter); (2) a period of time based on different weather conditions; (3) a period during the year when something usually happens] He says autumn is his favorite season. (1) She likes to visit there during the dry season. (2) He cannot wait for baseball season to start. (3)
seat [(1) a thing to sit on; (2) a place to sit or the right to sit there] The boy gave the woman his seat on the bus. (1) He has held his seat in parliament for 40 years. (2)
second [the one that comes after the first] This is the second time I have been here.
secret [(1) something known only to a few and kept from general knowledge; (2) hidden from others; (3) known only to a few] No member will talk about the secret ceremonies. (1) The nuclear scientist denied giving secret information to foreign spies. (2) Many secret stories of the Cold War are now becoming known. (3)
security [(1) freedom from danger or harm; (2) protection; (3) measures necessary to protect a person or place] Security was increased in the city. (1) The store provided its own security. (2) Strong national security kept the country safe. (3)
see [(1) to know or sense through the eyes; (2) to understand or know] Did you see her smile? (1) I see what you mean. (2)
seed [the part of a plant from which new plants grow] If you plant the seeds now, you can eat vegetables in two months.
seek(ing) [(1) to search for; (2) to try to get; (3) to plan to do] They are seeking a cure for cancer. (1) She is seeking election to public office. (2) Electric power companies are seeking to reduce their use of coal. (3)
seem [to appear to be] She seems to be in good health.
seize [(1) to take quickly by force; (2) to take control of quickly; (3) to arrest] Marines seized the island in three days. (1) The generals seized power after the president fled. (2) The policeman seized the suspect. (3)
self [all that which makes one person different from others] He seems to think only of himself.
sell [to give something in exchange for money] He will sell his car to me for 2,000 dollars.
