center + place in the middle of something
central + Being in the middle
recent + happening or beginning not long ago
recently + just a while ago; not long ago
cent + 100th of the basic unit of money e.g. there are 100 of these in a dollar
century + period of 100 years
concentrate + to pay great attention to a task; focus
concentration + paying ( a lot of) attention to a task
innocent + Free from evil or guilt
percent + One one-hundredth of a whole
percentage + part of a whole divided into hundredths
incentive + Something that encourages a person to work hard