sabotage
[to damage or destroy as an act against an organization or nation]
The rebels sabotaged the railroad.

sacrifice
[to do without something or to suffer a loss for a belief, idea, goal or another person]
She sacrificed her house to pay for medical school for her son.
　　
sad
[not happy]
He was sad because she left.

safe
[away from hamp3 or danger]
This is a safe place for you to stay.

sail
[to travel by boat or ship]
We will sail to Hawaii on Thursday.

sailor
[a person involved in sailing a boat or ship]
He is a sailor on one of the big oil ships.

salt
[a white substance found in seawater and in the ground, used to affect the taste of food]
The doctor says eating too much salt can raise my blood pressure.

same
[(1) not different; (2) not changed; (3) like another or others]
He eats at the same time every day. (1)
She looks the same as she did ten years ago. (2)
His car is the same as mine. (3)

sand
[extremely small pieces of crushed rock found in large amounts in deserts and on coasts]
The hot sand of the desert burned her feet.

satellite
[(1) a small object in space that moves around a larger object; (2) an object placed in orbit around the earth]
The Earth and other planets are satellites of the sun. (1)
A new communications satellite was put in orbit today. (2)

satisfy
[to give or provide what is desired, needed or demanded]
Does this food satisfy your hunger?

save
[(1) to make safe; (2) to remove from hamp3; (3) to keep for future use]
He saved the building by disamp3ing the bomb. (1)
The fireman saved her when he pulled her from the burning house. (2)
She saved a little money every week. (3)

say
[(1) to speak; (2) to express in words]
What will you say to her? (1)
I will say to her what is in my heart. (2)

school
[(1) a place for education; (2) a place where people go to learn]
Is your son going to public or private school? (1)
Her school is testing students to measure how much they have learned. (2)

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 infomp3ation to foreign spies. (2)
Many secret stories of the Cold War are now becoming known. (3)

security
[(1) freedom from danger or hamp3; (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.

Senate
[the smaller of the two groups in the governments of some countries, such as in the United States Congress]
The Senate has 100 members, two from each state.

send
[(1) to cause to go; (2) to pemp3it to go; (3) to cause to be carried, taken or directed to or away from a place]
She sent the boy away. (1)
To which university did he send his daughter? (2)
The government will send supplies immediately to the earthquake area. (3)

sense
[(1) to come to know about by feeling, believing or understanding; (2) any of the abilities to see, hear, taste, smell or feel]
He sensed that the dog would not attack him. (1)
The medicine affected his sense of taste. (2)

sentence
[(1) to declare the punishment for a crime; (2) the punishment for a crime]
The judge sentenced him to three years in prison. (1)
She received a sentence of 18 months of community service. (2)

separate
[(1) to set or keep people, things or ideas away from or independent from others; (2) not together or connected]
He separated the two boys and told them to stop fighting. (1)
They work in separate offices. (2)

series
[a number of similar things or events that follow one after another in time, position or order]
The doctor said the series of tests would show the cause of the pain.

serious
[(1) important; (2) needing careful consideration; (3) dangerous]
The two sides have begun serious negotiations. (1)
We have a serious problem to solve. (2)
The accident victim is reported to be in serious condition. (3)

serve
[(1) to work as an official; (2) to be employed by the government; (3) to assist or help]
He served as Secretary of State. (1)
She has served as a government employee for 30 years. (2)
She served us tea and made us feel welcome. (3)

service
[(1) an organization or system that provides something for the public; (2) a job that an organization or business can do for money; (3) military organizations such as an amp3y, navy or air force; (4) a religious ceremony]
Schools and roads are services paid for by taxes. (1)
His business provides childcare services for working parents. (2)
Two of her sons are in the military services. (3)
Our church provides three services every Sunday morning. (4)

set
[(1) to put in place or position; (2) to establish a time, price or limit]
She set food in front of us. (1)
Have you set a time for our meeting? (2)

settle
[(1) to end (a dispute); (2) to agree about (a problem); (3) to make a home in a new place]
The long dispute was finally settled. (1)
We settled our legal problem without going to court. (2)
Her family settled in Dallas many years ago. (3)