the quality of being difficult; "they agreed about the difficulty of the climb"
a factor causing trouble in achieving a positive result or tending to produce a negative result; "serious difficulties were encountered in obtaining a pure reagent"
a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome; "grappling with financial difficulties"
state insincerely; "He professed innocence but later admitted his guilt"; "She pretended not to have known the suicide bomber"; "She pretends to be an expert on wine"
confess one's faith in, or allegiance to; "The terrorists professed allegiance to the Muslim faith"; "he professes to be a Communist"
practice as a profession, teach, or claim to be knowledgeable about; "She professes organic chemistry"
take vows, as in religious order; "she professed herself as a nun"
receive into a religious order or congregation
state freely; "The teacher professed that he was not generous when it came to giving good grades"
a conflict of opposed ideas or attitudes or goals; "a collision of interests"
an accident resulting from violent impact of a moving object; "three passengers were killed in the collision"; "the collision of the two ships resulted in a serious oil spill"
(physics) an brief event in which two or more bodies come together; "the collision of the particles resulted in an exchange of energy and a change of direction"