obligatory
ob·li·ga·tory
adjective
1.
morally or legally constraining or binding
- “attendance is obligatory”
- “an obligatory contribution”
2.
Origin
From Middle English obligatorie, from Latin obligatōrius.
Related words
See also
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.