needing much effort or skill to accomplish, deal with, or understand.

found or distributed over large area or number of people.

Approximately; (of numbers) about; around.

Being what was wanted or needed. used to greet someone in polite or friendly way. Friendly greeting to someone who has arrived. To accept or receive something happily and gladly.

To be long enough to get to a certain place.

young human. More than one child.

connected with something else. To form a connection in your mind between things.

To cause someone's life to come to an end.

That is likely to happen or be true.

highly contagious viral infection of respiratory passages causing fever, severe aching, and catarrh.

cause, explanation, or justification for action or event. Explanations for why some things occurred or was done. think, understand, and form judgements logically.

Senior person who manages part of an organization.

(of disease) prevalent over whole country or world. outbreak of pandemic disease.

number equivalent to product of hundred and ten.

having been formally announced. To describe something by telling it to others.