breed animals or plants using parents of different races and varieties; "cross a horse and a donkey"; "Mendel tried crossbreeding"; "these species do not interbreed"
acting or arriving or performed exactly at the time appointed; "she expected guests to be punctual at meals"; "he is not a particularly punctual person"; "punctual payment"
appropriate for a condition or purpose or occasion or a person's character, needs; "everything in its proper place"; "the right man for the job"; "she is not suitable for the position"; "he is not a suitable husband for her"
marked by suitability or rightness or appropriateness; "proper medical treatment"; "proper manners"