ascertain
as|cer|tain /'æsərt'eɪn/ (ascertains ascertaining ascertained)
[VERB] V n, V that, V wh
If you ascertain the truth about something, you find out what it is, especially by making a deliberate effort to do so. (FORMAL)
Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading...
Once they had ascertained that he was not a spy, they agreed to release him...
Take time to ascertain what services your bank is providing, and at what cost.
= establish
[VERB] V n, V that, V wh
If you ascertain the truth about something, you find out what it is, especially by making a deliberate effort to do so. (FORMAL)
Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading...
Once they had ascertained that he was not a spy, they agreed to release him...
Take time to ascertain what services your bank is providing, and at what cost.
= establish